taxonID	type	description	language	source
9280DAEBDBAA5ECAB5F8CCCEDBAC3678.taxon	description	Figs 24, 30, 58 – 63, 138	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
9280DAEBDBAA5ECAB5F8CCCEDBAC3678.taxon	description	Description (based on holotype). Adult male Body size: 9.5 mm. Head. Face occupying around 2 / 5 of head width in frontal view; shiny black; white setulose laterally, black setulose sublaterally, bare at median part as wide as ~ 1 / 4 of width of face. Gena very narrow; black; white setulose. Oral margin laterally not produced. Frons black; medially bare, laterally black setulose. Vertex black; black setulose. Occiput black; dorsal 1 / 2 black setulose, ventral 1 / 2 white setulose. Eye bare. Antenna black, except pedicel and basal 1 / 6 of postpedicel brown; antennal ratio ~ 7: 1: 7.5. Thorax. Scutum shiny black, with bronze sheen on lateral 1 / 3 and faint dark blue sheen on median 1 / 3; black setulose, except for narrow fascia of golden yellow setulae along anterior margin. Postpronotum of same colour as scutum; black and dark yellow setulose. Postalar callus dark brown; black setulose. Scutellum trapezoid, with two calcars as long as ~ 1 / 3 of scutellar length; of same colour as scutum except calcars largely pale brown; black setulose anteriorly and medially, yellow setulose laterally and posteriorly. Pleura shiny blackish brown, except anepimeron and katepimeron pale brown. Anepisternum with shallow sulcus; dark yellow setulose anteriorly, black setulose posteriorly, widely bare medially and ventrally. Anepimeron black setulose anteriorly, dark yellow setulose posteriorly. Katepisternum with patch of pale yellow setulae dorsally and small patch of yellow setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter greyish yellow and halter pale yellow. Wing: hyaline; microtrichose, except bare on basal 1 / 3 of cell r 1, a small basal patch of r 2 + 3, most of cell br (only microtrichose along vena spuria), most of cell bm except for narrow median strip of microtrichiae, large part of cell dm (Fig. 24), anterobasal 1 / 2 of cell cup, and basomedian 3 / 4 of alula. Legs: femora black, only apex brown; black setulose. Tibiae brown at both ends, blackish in between; largely black setulose, with some pale setulae ventrally. Tarsi orange-brown; black setulose dorsally, golden yellow setulose ventrally. Coxae and trochanters blackish; fore and mid coxae black setulose anteriorly, pale setulose posteriorly; hind coxa silvery white setulose. Abdomen. Tergites black to blackish brown, slightly paler along lateral margins. Tergite 1 black setulose. Tergite 2 shiny, except for oval median dull macula and pair of smaller, oblique lateral maculae; black setulose, except yellow setulose in anterolateral corners, and white setulose along posterior margin. Tergite 3 dull, except for narrow shiny strips along lateral and posterior margins; black setulose, except narrowly white setulose along posterior margin. Tergite 4 shiny; black setulose, except white setulose in anterolateral corners and on pair of larger posterior patches. Sternites blackish; sternites 1 – 3 white, setulose, sternite 4 black setulose. Genitalia as in Fig. 138. Female. Unknown.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
9280DAEBDBAA5ECAB5F8CCCEDBAC3678.taxon	diagnosis	Diagnosis. Body length: male 9.5 – 10 mm (n = 2). Superficially, this species looks most similar to S. chloraspis Reemer, sp. nov., S. pallitarsis Reemer & Mengual, sp. nov., and S. varicaudata Reemer & Mengual, sp. nov., which are of similar size and colouration. These species also share the following combination of characters: face black, tibiae entirely brown, tergite 3 broadly dull with narrow shiny margins (Fig. 58). Serichlamys boti Reemer, sp. nov. differs from the three other species, as well as from all other known species of Serichlamys, in the partly bare wing cell dm (Fig. 24). It also differs from the three species mentioned above in the presence of only two basoventral setae on the surstylus (Fig. 138) (instead of 4 or 5 in the other three species, Figs 139 – 141). Serichlamys boti Reemer, sp. nov. is similar to S. pallitarsis Reemer & Mengual, sp. nov. in the pattern of dull maculae on tergite 2: dull maculae narrower than shiny areas separating them (wider than shiny areas in S. chloraspis Reemer, sp. nov. and S. varicaudata Reemer & Mengual, sp. nov.) (compare Figs 31, 33). Serichlamys boti Reemer, sp. nov. and pallitarsis Reemer & Mengual, sp. nov. also share orange tarsi (dark in S. chloraspis Reemer, sp. nov. and S. varicaudata Reemer & Mengual, sp. nov.). However, the partly bare wing cell dm (entirely microtrichose in S. pallitarsis) and the two basoventral setae on the surstylus (4 or 5 in S. pallitarsis Reemer & Mengual, sp. nov.) clearly separate this species. The holotype and the paratype differ in the colour of the setulae on the scutum: black except for narrow fascia of golden yellow setulae along anterior margin in the holotype, entirely golden yellow in the paratype.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
9280DAEBDBAA5ECAB5F8CCCEDBAC3678.taxon	etymology	Etymology. The name of this species is a patronym in honour of Sander Bot, who collected the holotype and one of the paratypes.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
9280DAEBDBAA5ECAB5F8CCCEDBAC3678.taxon	distribution	Distribution. This species is known from two localities on the western slope of the Andes: one in Colombia (elevation 1481 m), and one locality in Ecuador (elevation 1450 m).	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3C87FDB12F7B5B25BAC7DA126686EA09.taxon	description	Figs 5, 26, 31, 64 – 68, 139	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3C87FDB12F7B5B25BAC7DA126686EA09.taxon	description	Description (based on holotype). Adult male Body size: 10 mm. Head. Face occupying slightly less than 1 / 3 of head width in frontal view; shiny black; white setulose, except narrow bare patch below antennae. Gena very narrow; black; white setulose. Oral margin laterally not produced. Frons black; medially bare, laterally black setulose. Vertex black; black setulose except for small patch of golden yellow setulae anteriorly and a few scattered golden yellow setulae posteriorly. Occiput black; dorsal 1 / 3 golden yellow setulose, otherwise white setulose. Eye bare. Antenna blackish brown; antennal ratio ~ 4: 1: 5. Thorax. Scutum shiny black with clear green sheen; golden yellow setulose, except for small median patch of black setulae on anterior 1 / 3 and some scattered black setulae laterally posteriad of transverse suture. Postpronotum of same colour as scutum; golden yellow setulose. Postalar callus brown; yellow setulose with a few black setulae ventrolaterally. Scutellum trapezoid, with two calcars as long as ~ 1 / 4 of scutellar length; of same colour as scutum except calcars dull black; golden yellow setulose with a few black setulae posteriorly. Pleura shiny blackish brown. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally, black setulose posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose with a few black setulae dorsally. Katepisternum with patch of pale yellow setulae dorsally and small patch of whitish setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow. Wing: hyaline; microtrichose, except bare on basal 1 / 8 of cell r 1 (along vein RS), most of cell br (only microtrichose along vena spuria), posterobasal 1 / 3 of cell bm, anterobasal 1 / 3 of cell cup, and basomedian 1 / 2 of alula. Legs: femora and tibiae black, with tibiae a little brownish at both ends; tarsi brown, with apical tarsomeres paler than basal four tarsomeres. Femora black setulose, with ventrobasal patches of pale setulae. Tibiae black setulose anteriorly, white setulose posteriorly. Coxae and trochanters blackish brown; white setulose. Abdomen. Tergites black. Tergite 1 yellow setulose, except black setulose near lateral margin. Tergite 2 golden yellow setulose, except for two large, bare, strongly metallic green shiny maculae, and black setulose along posterior half of lateral margin. Tergite 3 on most of surface with a mixture of short erect golden yellow and black setula; golden yellow setulae along posterior and lateral margins longer and more appressed, resulting in a fascia along these margins. Tergite 4 mostly short appressed black setulose, but longer pale yellow to whitish setulose along lateral margins and on pair of large posterior patches. Sternites blackish brown; sternite 1 bare; sternites 2 and 3 yellowish white setulose; sternite 4 black setulose. Genitalia as in Fig. 139. Female. Unknown. The female listed under Additional material is included based on its COI barcode, but the specimen itself was not studied, as it was not possible for us to arrange a loan within the time frame of this study.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3C87FDB12F7B5B25BAC7DA126686EA09.taxon	diagnosis	Diagnosis. Body length: male 8 – 10 mm (n = 6). Superficially, this species looks most similar to S. boti Reemer, sp. nov., S. pallitarsis Reemer & Mengual, sp. nov. and S. varicaudata Reemer & Mengual, sp. nov., which are of similar size and colouration. These species also share the following combination of characters: face black, tibiae entirely brown, tergite 3 broadly dull with narrow shiny margins (Fig. 64). However, this is the only known species of Serichlamys with a strong metallic green shine on scutum and scutellum (Figs 31, 64). A weak metallic, sometimes green, shine also occurs in other species, but not as strong. In addition, there is a pair of large, smooth, metallic green maculae on tergite 2 (Fig. 31) (these maculae are not green in the three species mentioned above).	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3C87FDB12F7B5B25BAC7DA126686EA09.taxon	etymology	Etymology. The specific epithet is composed of the Greek words chloros (green) and aspis (shield). This name refers to the metallic green scutum and scutellum of this species.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3C87FDB12F7B5B25BAC7DA126686EA09.taxon	distribution	Distribution. This species is only known from Costa Rica, where it was found in the centre and southeast of the country at elevations between 50 and 1200 meters.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
0B29885933165805835441586D335C25.taxon	description	Figs 13, 18, 69 – 75, 142	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
0B29885933165805835441586D335C25.taxon	description	Description (based on holotype). Adult male Body size: 8 mm. Head. Face occupying ~ 1 / 3 of head width in frontal view; shiny black; white setulose, except black setulose on dorsal 1 / 4. Gena very narrow; black; white setulose. Oral margin laterally not produced. Frons black; medially bare, laterally black setulose. Vertex black; black setulose on anterior half, except for a few golden yellow setulae anteriorly, golden yellow setulose on posterior half. Occiput black; dorsal 1 / 2 golden yellow setulose, ventral 1 / 2 white setulose. Eye bare. Antenna orange-brown, except apical 1 / 3 of postpedicel black; antennal ratio ~ 2.5: 1: 4.5. Thorax. Scutum shiny black with faint metallic sheen; golden yellow setulose. Postpronotum of same colour as scutum; golden yellow setulose. Postalar callus pale brown; yellow setulose. Scutellum trapezoid, of same colour as scutum, with two pale yellow calcars as long as ~ 1 / 2 of scutellar length. Pleura shiny brown, except meron and ventral parts of katepisternum blackish. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow. Wing: hyaline; microtrichose, except bare on basal 1 / 4 of cell r 1 (along vein RS), most of cell br (only microtrichose along vena spuria), posterobasal 2 / 5 of cell bm, anterobasal 2 / 5 of cell cup, and basomedian 1 / 2 of alula. Legs: femora blackish brown, with apices narrowly yellowish; yellowish setulose except black setulose anterodorsally. Tibiae dark brown with vaguely demarcated black rings; yellowish setulose. Fore tarsus yellow setulose, mid tarsus yellow setulose except apical tarsomeres dorsally black setulose, hind tarsus black setulose dorsally and yellow setulose ventrally. Coxae and trochanters blackish brown; yellowish white setulose. Abdomen. Tergites black, except lateral margins and posterior margin of tergite 4 brown. Tergite 1 yellowish white setulose. Tergite 2 golden yellow setulose; strongly shiny medially, semi-shiny on lateral 1 / 4 due to microsculpture. Tergite 3 semi-shiny on most of surface, with small round maculae laterally and a smaller dull macula medially; golden yellow setulose except black setulose medially. Tergite 4 semi-shiny; golden yellow setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites brown; white setulose. Genitalia as in Fig. 142. Female. As male, except for following differences. Body length 11 mm. Scutellum yellow, strongly contrasting with scutum (Fig. 74). Tergites with lateral margins widely yellowish. Tergite 5 largely yellowish (Fig. 75). Legs pale brown, except tarsi dark brown.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
0B29885933165805835441586D335C25.taxon	diagnosis	Diagnosis. Body length: male 8 – 8.5 mm (n = 4), female 11 mm (n = 1). Together with S. mellimitis Reemer, sp. nov. and S. mitis, this species combines a black face with antennae in which the postpedicel has a dark tip (Figs 71, 72). This species differs from the other two by its entirely dark tarsi (Fig. 18), and the absence of a median projection on the ventral lobe of the surstylus (Fig. 142). In the female, the scutellum is yellow, contrasting strongly with the dark scutum (Fig. 74).	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
0B29885933165805835441586D335C25.taxon	etymology	Etymology. The species name refers to the species Serichlamys mitis (Curran), to which this new species is very similar. The prefix mela (from the Greek melas, black) was chosen because this species is more blackish in colouration than S. mitis.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
0B29885933165805835441586D335C25.taxon	distribution	Distribution. This species is only known from Salésopolis in the Brazilian State of São Paulo.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D42B8701F5A65A8A99DBDFD29A8E3FCD.taxon	description	Figs 14, 76 – 81, 143	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D42B8701F5A65A8A99DBDFD29A8E3FCD.taxon	description	Description (based on holotype). Adult male Body size: 6.5 mm. Head. Face occupying ~ 1 / 3 of head width in frontal view; shiny black; white setulose. Gena very narrow; black; white setulose. Oral margin laterally not produced. Frons black; medially bare, laterally black, and white setulose. Vertex black; golden yellow setulose anteriorly and posteriorly, black setulose in between. Occiput black; dorsal 1 / 2 golden yellow setulose, ventral 1 / 2 white setulose. Eye bare. Antenna orange-brown, except apical 1 / 3 of postpedicel darker; antennal ratio ~ 4: 1: 5. Thorax. Scutum shiny black with bronze sheen, margins brown; golden yellow setulose. Postpronotum and postalar callus brown; golden yellow setulose. Scutellum trapezoid, brown, with two pale yellow calcars as long as ~ 1 / 2 of scutellar length; golden yellow setulose. Pleura shiny brown. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter yellowish white. Wing: hyaline; microtrichose, except bare on basal 1 / 3 of cell r 1, most of cell br (only microtrichose along vena spuria and in apical 1 / 5), posterobasal 2 / 3 of cell bm, anterobasal 1 / 3 of cell cup, and basomedian 1 / 2 of alula. Legs: brown, with femora, tibiae around cicatrices, and basal tarsomeres a bit darker than other parts; yellow and white setulose. Coxae and trochanters brown; yellow and white setulose. Abdomen. Tergites dark brown, except lateral margins pale brown, and tergite 4 with two large yellowish brown maculae on posterior 2 / 5, which are connected along posterior margin. Tergite 1 yellowish white setulose. Tergite 2 shiny; yellowish white setulose. Tergite 3 semi-shiny with dark and dull, characteristically shaped macula over most of width; yellowish white setulose on shiny parts, black setulose on dull part. Tergite 4 semi-shiny; yellowish white setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites 1 – 3 dark brown; yellowish white setulose. Sternite 4 yellowish brown; dark brown setulose. Genitalia as in Fig. 143. Female. Unknown.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D42B8701F5A65A8A99DBDFD29A8E3FCD.taxon	diagnosis	Diagnosis. Body length: male 5.5 – 6.5 mm (n = 4). Together with S. melamitis Reemer, sp. nov. and S. mitis, this species combines a black face with antennae in which the postpedicel has a dark tip (Figs 78, 79). This species differs from the other two by the characteristically shaped dull macula on tergite 3, which is wide and has three posterior ‘ lobes’ or extensions (Figs 14, 76). It also differs from the other two species by the widely yellow lateral margins of tergites 2 – 4 (Figs 76, 77). Male genitalia as in Fig. 143.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D42B8701F5A65A8A99DBDFD29A8E3FCD.taxon	etymology	Etymology. The species name refers to the species Serichlamys mitis (Curran), to which this new species is very similar. The prefix melli (from the Latin mellis, honey) was chosen because this species is more honey-coloured than S. mitis.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D42B8701F5A65A8A99DBDFD29A8E3FCD.taxon	distribution	Distribution. This species is only known from Belo Horizonte in the Brazilian State of Minas Gerais.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
636A79976D0950D09718649559594F67.taxon	description	Figs 8, 10, 15, 16, 19, 21, 23, 82 – 86, 144	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
636A79976D0950D09718649559594F67.taxon	diagnosis	Diagnosis. Body length: male 6.5 – 8 mm (n = 24), female 7.5 – 9.5 mm (n = 8). Together with S. melamitis Reemer, sp. nov. and S. mellimitis Reemer, sp. nov., this species combines a black face with antennae in which the postpedicel has a dark tip. This species differs from S. melamitis Reemer, sp. nov. by colouration of the tarsi (brown with apical tarsomere yellow, instead of entirely black) (Fig. 19). The male differs from S. melamitis Reemer, sp. nov. in the presence of a median projection on the ventral lobe of the surstylus (Fig. 144). The female differs from S. melamitis Reemer, sp. nov. in the brown scutellum (yellow in S. melamitis Reemer, sp. nov.). From S. mellimitis Reemer, sp. nov. this species differs in the presence of three separate dull maculae on tergite 3 (Figs 15, 16), and the brown lateral margins of the tergites (Figs 82 – 84). Male genitalia as in Fig. 144.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
636A79976D0950D09718649559594F67.taxon	distribution	Distribution. This species is only known from Rio de Janeiro in Brazil.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
F78BF59C98B35060B3D314B82DD2A7F8.taxon	description	Figs 37, 40, 44, 45, 50, 87 – 92, 146	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
F78BF59C98B35060B3D314B82DD2A7F8.taxon	diagnosis	Diagnosis. Body length: male 7 – 7.5 mm (n = 2), female: 9 mm (n = 1). Among the species of Serichlamys with a yellow face, this species can be identified by the following combination of characters: abdomen with greatest width at transition of tergites 2 and 3, scutellar calcars acute (not flattened or spoon-shaped), antennae pale brown, legs entirely brown with femora only slightly darker than tibiae. Male genitalia as in Fig. 146. The female cannot be distinguished with certainty from specimens of S. serpentiphallus Reemer, sp. nov. and S. simpliciphallus Reemer, sp. nov.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
F78BF59C98B35060B3D314B82DD2A7F8.taxon	distribution	Distribution. This species is known from the Brazilian states São Paulo and Rio de Janeiro.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D5C51706932051F5A0E72C69CD12DCAC.taxon	description	Figs 9, 28, 32, 34, 93 – 97, 140	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D5C51706932051F5A0E72C69CD12DCAC.taxon	description	Description (based on holotype). Adult male Body size: 9 mm. Head. Face occupying ~ 2 / 5 of head width in frontal view; shiny black; yellowish white setulose, except black setulose on dorsal 1 / 4. Gena very narrow; black; white setulose. Oral margin laterally not produced. Frons black; medially bare, laterally black setulose except yellowish white setulose along eye margin. Vertex black; golden yellow setulose. Occiput black; dorsal 1 / 2 golden yellow setulose, ventral 1 / 2 white setulose. Eye bare. Antenna: scape black, pedicel and postpedicel dark brown; antennal ratio as ~ 7: 1: 7. Thorax. Scutum shiny black with faint greenish metallic sheen, margins shiny dark brown; golden yellow setulose. Postpronotum and postalar callus shiny dark brown; golden yellow setulose. Scutellum trapezoid, shiny dark brown, with two apical calcars as long as ~ 1 / 3 of scutellar length. Pleura shiny brown, except meron and ventral parts of katepisternum blackish. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of yellowish setulae dorsally and a few yellowish setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow. Wing: hyaline; microtrichose, except bare on basal 2 / 5 of cell r 1, most of cell br (only microtrichose along vena spuria), posterobasal 1 / 2 of cell bm, anterobasal 1 / 2 of cell cup, and basomedian 4 / 5 of alula. Legs (Figs 9, 28): femora blackish brown, with apices narrowly yellowish; black setulose anteriorly, yellow setulose posteriorly. Tibiae dark brown with vaguely demarcated blackish rings; yellow and white setulose. Tarsi yellowish brown; black setulose dorsally, yellow setulose ventrally. Coxae and trochanters blackish; yellow and white setulose. Abdomen. Tergites blackish, with lateral and posterior margins brown. Tergite 1 yellowish setulose. Tergite 2 shiny (subshiny on lateral 1 / 4 due to microsculpture) with three dull maculae: a small oval median one and a pair of small oblique lateral ones; yellowish setulose laterally, white setulose medially. Tergite 3 dull on most of surface, with lateral and posterior margins shiny; yellow setulose on shiny parts, black setulose on dull parts. Tergite 4 semi-shiny; golden yellow setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites brown; yellow setulose. Genitalia as in Fig. 140. Female. As male, except for following differences. Face, frons, vertex, and occiput entirely black setulose. Postpedicel orange. Scutum, scutellum, and pleura black setulose. Wings infuscate, especially around veins. Tergite 5 yellowish brown.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D5C51706932051F5A0E72C69CD12DCAC.taxon	diagnosis	Diagnosis. Body length: male 8.5 – 10 mm (n = 4), female 11 mm (n = 1). Superficially, this species looks most similar to S. boti Reemer, sp. nov., S. chloraspis Reemer, sp. nov., and S. varicaudata Reemer & Mengual, sp. nov., which are of similar size and colouration. These species also share the following combination of characters: face black, tibiae entirely brown, tergite 3 broadly dull with narrow shiny margins. From S. chloraspis Reemer, sp. nov. and S. varicaudata Reemer & Mengual, sp. nov. this species differs by the entirely orange tarsi (dark in S. chloraspis Reemer, sp. nov. and S. varicaudata Reemer & Mengual, sp. nov.). From S. boti Reemer, sp. nov. it differs by the entirely microtrichose wing cell dm (partly bare in S. boti Reemer, sp. nov.), as well as by the presence of 4 or 5 basoventral setae on the surstylus (2 in S. boti Reemer, sp. nov.). Male genitalia as in Fig. 140.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D5C51706932051F5A0E72C69CD12DCAC.taxon	etymology	Etymology. The specific epithet is a noun referring to the pale (pallidus, L. = pale) tarsi of this species.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
D5C51706932051F5A0E72C69CD12DCAC.taxon	distribution	Distribution. This species is only known from the Valle del Cauca area on the western slopes of the Andes in Colombia.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3F8873C640975259A6626D7B6130E909.taxon	description	Figs 6, 42, 48, 53 – 55, 98 – 102, 148	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3F8873C640975259A6626D7B6130E909.taxon	description	Description (based on holotype). Adult male Body size: 8 mm. Head. Face occupying ~ 1 / 3 of head width in frontal view; shiny yellowish brown (in Fig. 100 there appears to be a yellow median vitta, but this is an artefact of lighting conditions, which highlight some pale subcuticular structure); yellowish white setulose. Gena yellow; white setulose. Oral margin laterally hardly produced. Frons brown; medially bare, laterally black setulose. Vertex brown; golden yellow setulose. Occiput brown; dorsal 1 / 2 golden yellow setulose, ventral 1 / 2 white setulose. Eye bare. Antenna orange-brown; antennal ratio ~ 2: 1: 3. Thorax. Scutum blackish brown with bronze sheen, margins brown; golden yellow setulose. Postpronotum and postalar callus brown; golden yellow setulose. Scutellum trapezoid, brown; golden yellow setulose; with two dorsoventrally flattened, spoon-shaped calcars as long as ~ 1 / 3 of scutellar length. Pleura brown. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow. Wing: hyaline; microtrichose, except bare on narrow strip along vein RS in cell r 1, most of cell br (only microtrichose along vena spuria), posterobasal 1 / 5 of cell bm, anterobasal 1 / 4 of cell cup, and basomedian 2 / 3 of alula. Legs: pale brown, with femora and hind metatarsus somewhat darker; yellow to white setulose, except mid and hind tarsus dorsally with some black setulae. Coxae and trochanters brown; yellow to white setulose. Abdomen. Tergites dark brown, except lateral margins and posterior margin of tergite 4 paler brown. Tergite 1 white setulose. Tergite 2 medially shiny except for small median patch of grey microtrichia, laterally dull due to grey microtrichia; medially white setulose, laterally yellow setulose. Tergite 3 dull on most of surface, with lateral and posterior margins shiny; black setulose on dull parts, yellowish white setulose on shiny parts. Tergite 4 semi-shiny; golden yellow setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites yellowish brown; yellowish white setulose. Genitalia as in Fig. 148. Female. One female probably belonging to this species was collected at the same site and date as one of the males listed among the additional specimens. It differs in paler overall colouration, which is probably either a result of the specimen being teneral at time of collecting, or of preservation methods. Tergites 4 and 5 are entirely yellowish brown.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3F8873C640975259A6626D7B6130E909.taxon	diagnosis	Diagnosis. Body length: male 7.5 – 8.5 mm (n = 10), female 8.5 mm (n = 1). Together with S. simpliciphallus Reemer, sp. nov. and S. spathulata Reemer, sp. nov., this species belongs to a group of three species of which most (not all!) specimens have dorsoventrally flattened, spoon-shaped calcars on the scutellum (Figs 51 – 57). From S. spathulata Reemer, sp. nov. it differs by the presence of separate patches of microtrichia on tergite 2 (Fig. 48), the brown postpedicel, and the structure of the male genitalia (Fig. 148). From S. simpliciphallus Reemer, sp. nov. this species can only be reliably distinguished by the structure of the male genitalia, most notably the shape of the phallus: S-shaped in S. serpentiphallus Reemer, sp. nov., straight in S. simpliciphallus Reemer, sp. nov. Other characters, such as colouration of integument and setulosity, as well as distribution of microtrichia on the tergites, were found to be too variable among the studied specimens. Females are undistinguishable from S. simpliciphallus Reemer, sp. nov. at present.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3F8873C640975259A6626D7B6130E909.taxon	etymology	Etymology. The name serpentiphallus is a noun composed of the Latin words serpens (snake) and phallus (phallus). It refers to the s-shaped phallus of the male of this species.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
3F8873C640975259A6626D7B6130E909.taxon	distribution	Distribution. This species is known from the Brazilian States of São Paulo and Rio de Janeiro.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
4CF2093CEBB359629928F7A395FF357F.taxon	description	Figs 39, 43, 56, 57, 103 – 106, 149	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
4CF2093CEBB359629928F7A395FF357F.taxon	description	Description (based on holotype). Adult male Body size: 8 mm. Head. Face occupying ~ 1 / 3 of head width in frontal view; shiny yellowish brown; white setulose. Gena yellow; white setulose. Oral margin laterally hardly produced. Frons brown; medially bare, laterally golden yellow setulose. Vertex brown; golden yellow setulose. Occiput brown except medially blackish; dorsal 1 / 2 golden yellow setulose, ventral 1 / 2 white setulose. Eye bare. Antenna orange-brown; antennal ratio as ~ 4: 1: 4. Thorax. Scutum blackish with bronze sheen, margins brown; golden yellow setulose. Postpronotum and postalar callus brown; golden yellow setulose. Scutellum trapezoid, brown; golden yellow setulose; with two dorsoventrally flattened, spoon-shaped calcars as long as ~ 1 / 4 of scutellar length. Pleura brown. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow. Wing: hyaline; microtrichose, except bare on most of cell br (only microtrichose along vena spuria), posterobasal 1 / 5 of cell bm, anterobasal 1 / 5 of cell cup, and basomedian 2 / 5 of alula. Legs: pale brown, with femora and hind metatarsus somewhat darker; yellow to white setulose. Coxae and trochanters brown; yellow to white setulose. Abdomen. Tergites dark brown, except lateral margins and posterior margins of tergites 3 and 4 paler brown. Tergite 1 yellowish setulose. Tergite 2 with three large patches of grey microtrichiae, with narrow shiny parts in between; medially white setulose, laterally yellow setulose. Tergite 3 dull on most of surface, with lateral and posterior margins shiny; black setulose on dull parts, yellowish white setulose on shiny parts. Tergite 4 semi-shiny; golden yellow setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites yellowish brown; yellowish white setulose. Genitalia as in Fig. 149. Female. One female (see Additional specimens) probably belonging to this species was collected at the same site and date as one of the male paratypes. Apart from usual sexual dimorphism, no important differences were noted.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
4CF2093CEBB359629928F7A395FF357F.taxon	diagnosis	Diagnosis. Body length: male 8 – 8.5 mm (n = 12), female 9 mm (n = 1). Together with S. serpentiphallus Reemer, sp. nov. and S. spathulata Reemer, sp. nov., this species belongs to a group of three species of which most (not all!) specimens have dorsoventrally flattened, spoon-shaped calcars on the scutellum (Figs 51 – 57). From S. spathulata Reemer, sp. nov. it differs by presence of separate patches of microtrichia on tergite 2 (Fig. 48), the brown postpedicel, and the structure of the male genitalia (Fig. 149). From S. simpliciphallus Reemer, sp. nov. this species can only be reliably distinguished by the structure of the male genitalia, most notably the shape of the phallus: S-shaped in S. serpentiphallus Reemer, sp. nov., straight in S. simpliciphallus Reemer, sp. nov. Other characters, such as colouration of integument and setulosity, as well as distribution of microtrichia on the tergites, were found to be too variable among the studied specimens. Females are undistinguishable from S. serpentiphallus Reemer, sp. nov. at present.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
4CF2093CEBB359629928F7A395FF357F.taxon	etymology	Etymology. The name simpliciphallus is a noun composed of the Latin words simplex (simplicity) and phallus (phallus). It refers to the ‘ simple’ shaped phallus of the male of this species, in contrast with the otherwise morphologically very similar S. serpentiphallus.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
4CF2093CEBB359629928F7A395FF357F.taxon	distribution	Distribution. This species is only known from the Brazilian State of São Paulo.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
183253620AEB5D2CBD5B963BE2084F3E.taxon	description	Figs 41, 46, 47, 51, 52, 107 – 112, 147	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
183253620AEB5D2CBD5B963BE2084F3E.taxon	description	Description (based on holotype). Adult male Body size: 7 mm. Head. Face occupying ~ 1 / 3 of head width in frontal view; shiny yellowish brown; white setulose. Gena yellow; white setulose. Oral margin laterally hardly produced. Frons brown; medially bare, laterally black setulose. Vertex brown; golden yellow setulose. Occiput brown except medially blackish; dorsal 1 / 2 golden yellow setulose, ventral 1 / 2 white setulose. Eye bare. Antenna blackish brown, basal 1 / 4 of postpedicel paler; antennal ratio ~ 3: 1: 4.5. Thorax. Scutum blackish with bronze sheen, margins brown; golden yellow setulose. Postpronotum and postalar callus brown; golden yellow setulose. Scutellum trapezoid, brown; golden yellow setulose; with two dorsoventrally flattened, spoon-shaped calcars as long as ~ 1 / 3 of scutellar length. Pleura brown. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow. Wing: hyaline; microtrichose, except bare on narrow strip in cell r 1 along vein RS, most of cell br (only microtrichose along vena spuria), very narrowly along posterior margin of cell bm, and basomedian 1 / 3 of alula. Legs: pale brown, with femora somewhat darker; yellow to white setulose, except mid and hind femora anteriorly black setulose. Coxae and trochanters brown; yellow to white setulose. Abdomen. Tergites dark brown, except lateral margins and posterior margins of tergites 3 and 4 paler brown. Tergite 1 white setulose. Tergite 2 largely grey microtrichose, with submedian pair of small, vaguely demarcated shiny maculae; white setulose. Tergite 3 dull on most of surface, with lateral and posterior margins shiny; black setulose on dull parts, white setulose on shiny parts. Tergite 4 semi-shiny; yellowish setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites yellowish brown; white setulose. Genitalia as in Fig. 147. Female. As male, except for following differences. Body length 10 mm (n = 1). Antenna: scape and pedicel brow, postpedicel blackish. Legs entirely yellowish brown. Tergite 5 dark brown; yellowish setulose laterally and posteriorly, black setulose anteriorly and medially.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
183253620AEB5D2CBD5B963BE2084F3E.taxon	diagnosis	Diagnosis. Body length: male 7 – 8 mm (n = 10), female 10 mm (n = 1). Together with S. serpentiphallus Reemer, sp. nov. and S. simpliciphallus Reemer, sp. nov., this species belongs to a group of three species of which most (not all!) specimens have dorsoventrally flattened, spoon-shaped calcars on the scutellum (Figs 51 – 57). From both species, as well as from S. mus (Curran), it differs by the wide fascia of grey microtrichia on tergite 2, with at most a pair of smaller round bare parts laterally (Figs 46, 47). It also differs from the three aforementioned species by the black postpedicel (at most basal 1 / 4 paler). Male genitalia as in Fig. 147.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
183253620AEB5D2CBD5B963BE2084F3E.taxon	etymology	Etymology. The name spathulata is an adjective derived from spatha, the Latin word for spoon. It refers to the spoon-shaped scutellar calcars.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
183253620AEB5D2CBD5B963BE2084F3E.taxon	distribution	Distribution. This species is only known from the Brazilian State of São Paulo.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
8FD053E07DCD5B8F82137F7A6D69496E.taxon	description	Figs 36, 113 – 117, 145	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
8FD053E07DCD5B8F82137F7A6D69496E.taxon	description	Description (based on holotype). Adult male Body size: 6 mm. Head. Face occupying ~ 1 / 3 of head width in frontal view; shiny yellowish brown; white setulose. Gena yellow; white setulose. Oral margin laterally hardly produced. Frons yellowish brown; medially bare, laterally golden yellow setulose. Vertex yellowish brown; golden yellow setulose. Occiput pale brown, white setulose. Eye bare. Antenna yellowish brown; antennal ratio ~ 2.5: 1: 4.5. Thorax. Scutum shiny yellowish brown; golden yellow setulose. Postpronotum and postalar callus yellowish brown; golden yellow setulose. Scutellum trapezoid, yellowish brown; black setulose medially, golden yellow setulose laterally and posteriorly; with two acute calcars as long as ~ 1 / 3 of scutellar length. Pleura yellowish brown. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow. Wing: hyaline; microtrichose, except bare on narrow strip in cell r 1 along vein RS, most of cell br (only microtrichose along vena spuria), posterobasal 1 / 4 of cell bm, and basomedian 1 / 4 of alula. Legs: pale brown, with femora and hind metatarsus somewhat darker; yellow to white setulose. Coxae and trochanters brown; yellow to white setulose. Abdomen. Tergites dark brown, except tergite 2 medially pale brown and tergite 3 with pair of wide pale brown maculae along posterior margin. Tergites 1 and 2 white setulose. Tergite 3 black setulose anteromedially, white setulose laterally and posteriorly. Tergite 4 yellowish setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites yellowish; white setulose. Genitalia as in Fig. 145. Female. Unknown.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
8FD053E07DCD5B8F82137F7A6D69496E.taxon	diagnosis	Diagnosis. Body length: male 6 mm (n = 1). This is the only known species of Serichlamys with a pale face in which the abdomen is at its widest around halfway tergite 2 (Figs 36, 113) (this is also the case in S. melamitis Reemer, sp. nov., S. mellimitis Reemer, sp. nov. and S. mitis, but in these species the face is dark). Its colouration is also characteristic, with a yellowish brown scutum and pattern of dark and pale maculae on the tergites (Fig. 36). Because of these characters, this species reminds of certain Neotropical species of stingless bees. Male genitalia as in Fig. 145.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
8FD053E07DCD5B8F82137F7A6D69496E.taxon	etymology	Etymology. The name trigonoides is an adjective derived from the name Trigona Jurine, 1807, a commonly occurring genus of stingless bees (Apidae: Meliponini) in South America. The habitus of S. trigonoides reminds of those bees.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
8FD053E07DCD5B8F82137F7A6D69496E.taxon	distribution	Distribution. This species is only known from the Brazilian State of São Paulo.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C402A79A34DD5EE08B5C26525CA70278.taxon	description	Figs 1 – 4, 11, 17, 27, 29, 33, 35, 118 – 125, 141	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C402A79A34DD5EE08B5C26525CA70278.taxon	description	Description (based on holotype). Adult male Body size: 9.5 mm. Head. Face occupying ~ 2 / 5 of head width in frontal view; shiny black; white setulose, except black setulose on dorsal 1 / 4. Gena very narrow; black; white setulose. Oral margin laterally not produced. Frons black; medially bare, laterally black setulose except white setulose along eye margin. Vertex black; black setulose. Occiput black; dorsal 1 / 2 golden yellow setulose, ventral 1 / 2 white setulose. Eye bare. Antenna: scape black, pedicel and postpedicel dark brown; antennal ratio ~ 4: 1: 5. Thorax. Scutum shiny black with bronze sheen; golden yellow setulose. Postpronotum and postalar callus shiny brown; golden yellow setulose. Scutellum trapezoid, of same colour as scutum, with two apical calcars as long as ~ 2 / 5 of scutellar length. Pleura greyish brown, except meron and ventral parts of katepisternum blackish. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow. Wing: hyaline; microtrichose, except bare on basal 1 / 4 of cell r 1, most of cell br (only microtrichose along vena spuria), posterobasal 1 / 2 of cell bm, anterobasal 1 / 3 of cell cup, and basomedian 3 / 5 of alula. Legs: femora black; yellow to white setulose. Tibiae black, apices narrowly brown; white setulose. Tarsi black with apical tarsomere yellowish brown; black setulose dorsally, yellow setulose ventrally. Coxae and trochanters blackish; yellow and white setulose. Abdomen. Tergites blackish, with lateral and posterior margins brown. Tergite 1 yellowish white setulose. Tergite 2 shiny with three large dull maculae; yellowish white setulose. Tergite 3 dull on most of surface, with lateral and posterior margins shiny; yellowish white setulose on shiny parts, black setulose on dull parts. Tergite 4 semi-shiny; reddish yellow setulose laterally and posteriorly, black setulose anteriorly and medially, white setulose in anterolateral corners. Sternites blackish; yellow setulose. Genitalia as in Fig. 141. Female. As male, except for following differences. Face, frons, and vertex black setulose except for pair of small patches of white setulae along eye margin. Scutum, scutellum, and pleura black setulose. Tergite 5 yellow to yellowish brown; yellow setulose.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C402A79A34DD5EE08B5C26525CA70278.taxon	diagnosis	Diagnosis. Body length: male 9 – 10 mm (n = 10), female 11 – 12 mm (n = 2). Superficially, this species looks most similar to S. boti Reemer, sp. nov., S. chloraspis Reemer, sp. nov., and S. pallitarsis Reemer & Mengual, sp. nov., which are of similar size and colouration. These four species all have a black face, entirely dark tibiae, a uniformly coloured postpedicel, and a large rectangular dull area on tergite 3. The combination of the following characters distinguishes S. varicaudata Reemer & Mengual, sp. nov. from the other three species: wing cell dm entirely microtrichose (partly bare in S. boti Reemer, sp. nov.), scutum and scutellum without strong metallic green shine (green metallic in S. chloraspis Reemer, sp. nov.), tergite 2 with lateral dull parts large (Fig. 33) (small in S. boti Reemer, sp. nov. and S. pallitarsis Reemer & Mengual, sp. nov.; Figs 30, 32), hind metatarsus dorsally black (orange in S. boti Reemer, sp. nov. and S. pallitarsis Reemer & Mengual, sp. nov.). Male genitalia as in Fig. 141.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C402A79A34DD5EE08B5C26525CA70278.taxon	etymology	Etymology. The specific epithet is composed of the Latin words varius (different) and cauda (tail). The name refers to the variability of the colouration of both integument and setulosity of tergite 4.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C402A79A34DD5EE08B5C26525CA70278.taxon	distribution	Distribution. This species is only known from Ecuador, where it was found on eastern and western slopes of the Andes at elevations between 1800 and 2200 meters.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C4D2B1C6D080536F8F690EB346C985E3.taxon	description	Figs 7, 126 – 130, 150 – 153	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C4D2B1C6D080536F8F690EB346C985E3.taxon	description	Description (based on holotype). Adult male Body size: 6.5 mm. Head. Face occupying slightly <1 / 3 of head width in frontal view; shiny black with faint green hue; white setulose. Gena very narrow; black; white setulose. Oral margin laterally not produced. Frons black; medially bare, laterally with mixed white and black setulae. Vertex black; black setulose except yellowish setulose along anterior and posterior margins. Occiput black; dorsal 1 / 3 pale yellow setulose, otherwise white setulose. Eye bare. Antennal fossa slightly higher than wide. Antenna blackish brown; antennal ratio ~ 4: 1: 4.5. Thorax. Scutum shiny black, with green sheen on median 1 / 3 and bronze sheen on lateral 1 / 3; black golden yellow setulose on anterior 1 / 4 and narrowly along lateral and posterior margins, otherwise black setulose. Postpronotum and postalar callus yellowish brown; yellow setulose. Scutellum trapezoid, with two calcars as long as ~ 1 / 4 of scutellar length; shiny dark brown with faint greenish sheen, except calcars yellow; yellow setulose. Pleura shiny dark to yellowish brown. Anepisternum with shallow sulcus; yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron yellow setulose with a few black setulae dorsally. Katepisternum with patch of white setulae dorsally and small patch of white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter pale yellow, halter white. Wing: hyaline; microtrichose, except bare on basal cell bc, posterobasal 1 / 3 of cell c, basal 3 / 5 of cell r 1, basal 1 / 8 of cell r 2 + 3, most of cell br (only microtrichose along vena spuria), slightly more than posterior 1 / 2 of cell bm, anterior 1 / 2 of cell cup, and basomedian 2 / 3 of alula. Legs: femora blackish brown with yellow apices; yellow setulose. Tibiae pale yellow at basal 2 / 3, pale brown at apical 1 / 3, and blackish brown around cicatrix; yellow setulose except black setulose on inner side at apical 1 / 3. Tarsi pale brown; black setulose dorsally, yellow setulose laterally and ventrally. Coxae and trochanters brown; pale yellow to white setulose. Abdomen. Tergites blackish brown, mostly shiny except for large part of tergite 3. Tergite 1 white setulose. Tergite 2 shiny except for small median dull macula, with distinct metallic sheen at lateral 1 / 4; whitish setulose, except for some black setulae along lateral margin. Tergite 3 dull black, except for narrow fascia with bronze sheen along posterior and lateral margins; dull part short black setulose except for pale setulae posteromedially, shiny parts longer yellowish white setulose. Tergite 4 entirely shiny but not metallic; mostly short black setulose, but longer pale yellow to whitish setulose along lateral margins and on pair of large posteromedian patches. Sternites blackish brown; all sternites white setulose. Genitalia as in Figs 150 – 153: phallus with large, subapical flag-like projection. Female (based on paratype) As male, except for usual sexual dimorphism and following differences. Scutum largely black setulose, except for yellowish setulae along anterior margin. Tergites somewhat paler brown than in male.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C4D2B1C6D080536F8F690EB346C985E3.taxon	diagnosis	Diagnosis. Body length: male 6.0 – 7.0 mm (n = 19), female 8.5 – 9 mm (n = 3). The combination of a black face with a contrasting colour pattern on the tibiae (Fig. 7) sets this species apart from all other species in the genus. Besides, the male genitalia are very distinct in the fact that the phallus carries a ‘ flag-like’ apicodorsal projection (Figs 150 – 153).	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C4D2B1C6D080536F8F690EB346C985E3.taxon	etymology	Etymology. The specific epithet is a noun in apposition composed of the Latin words vexillum (flag) and phallus (penis). It refers to the characteristic dorsal projection on the phallus in males of this species.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
C4D2B1C6D080536F8F690EB346C985E3.taxon	distribution	Distribution. This species is known from Ecuador (n = 13), Peru (n = 1) and Panama (n = 1). In the first two countries, it has been found at elevations between 300 and 1100 meter, at slopes of the Andes and in lowland rainforest. In Panama it was found in rainforest at 800 meters of altitude. Based on these records, it can be expected that this species also occurs in Colombia.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
FA3730977E965080A27FEC03D05F5E69.taxon	description	Figs 38, 131 – 137, 154	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
FA3730977E965080A27FEC03D05F5E69.taxon	description	Description (based on holotype). Adult male Body size: 7 mm. Head. Face occupying ~ 1 / 3 of head width in frontal view; shiny yellowish brown; white setulose, except for bare median part. Gena yellow; white setulose. Oral margin laterally hardly produced. Frons dark brown; medially bare, laterally black setulose. Vertex brown; golden yellow setulose anteriorly and posteriorly, black setulose in between. Occiput blackish; white setulose. Eye bare. Antenna: scape and pedicel black, postpedicel dark brown; antennal ratio ~ 3.5: 1: 4.5. Thorax. Scutum blackish with bronze sheen, margins brown; golden yellow setulose. Postpronotum and postalar callus brown; golden yellow setulose. Scutellum trapezoid, brown; black setulose medially, golden yellow setulose laterally and posteriorly; with two pale, acute, converging calcars as long as ~ 1 / 3 of scutellar length. Pleura blackish brown, except katepimeron and margins of some other pleurites yellowish brown. Anepisternum with shallow sulcus; yellowish white setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron yellowish white setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter yellowish white. Wing: hyaline; microtrichose, except bare on basal 2 / 3 of cell br (and microtrichose along vena spuria), basal 1 / 3 of cell bm, and anterobasal 1 / 10 of cup. Legs: yellow, except basal 1 / 2 of fore femur and basal 2 / 3 of mid and hind femora black; pale yellow setulose, except femora largely black setulose. Coxae and trochanters blackish brown; yellow to white setulose. Abdomen. Tergites blackish, except lateral margins brown (brown parts widening towards apex of abdomen). Tergite 1 white setulose. Tergite 2 white setulose. Tergite 3 dull on most of surface, with lateral and posterior margins shiny; black setulose on dull parts, white setulose on shiny parts. Tergite 4 shiny; yellowish setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites yellowish brown; yellowish setulose with some black setulae on sternite 4. Genitalia as in Fig. 154. Female. Unknown.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
FA3730977E965080A27FEC03D05F5E69.taxon	diagnosis	Diagnosis. Body length: male 7 mm (n = 1). This is the only known species of Serichlamys which combines a yellow face, femora which are 2 / 3 black, and yellow tibiae and tarsi. Male genitalia as in Fig. 154. Female unknown.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
FA3730977E965080A27FEC03D05F5E69.taxon	etymology	Etymology. The species name is derived from the Greek words xanthos (yellow) and kneme (tibia). This name was chosen because of the yellow tibiae of this species.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
FA3730977E965080A27FEC03D05F5E69.taxon	distribution	Distribution. This species is only known from the Brazilian state São Paulo.	en	Reemer, Menno, Mengual, Ximo (2025): Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae). ZooKeys 1243: 51-106, DOI: 10.3897/zookeys.1243.132809
