taxonID	type	description	language	source
03BA0E15946BFFEBFC4F3D8CC64A4C87.taxon	discussion	REMARKS The genus Maculonomia was originally established as a subgenus of Nomia Latreille, 1804 (Wu 1982) and was kept within an ill-defined Nomia by Michener (2007), although as a synonym of Acunomia Cockerel, 1930. More recently Maculonomia has been recognized as a genus distinct from Nomia (e. g. Pauly 2009) and separate from Acunomia Cockerell, 1930 and Curvinomia Michener, 1944, which had also been placed within Acunomia (Michener 2007). Maculonomia is likely related to Curvinomia (Pauly 2009; Niu et al. 2017) but can be separated from the latter by the following characteristics: mesoscutal punctation generally finer and simple (deeper and often doubled in Curvinomia); anterior apical corner of forewing lightly to darkly infuscate (apical parts of wing faintly infumate in Curvinomia); outer metatibial spur of female simple (spur with strong subapical branch); metabasitibial plate of female elevated, triangular, and nearly glabrous (shield-shaped and typically setose in Curvinomia); metafemur of male generally slender, smooth and concave ventrally (metafemur thicker and laterally compressed in Curvinomia). In addition, the metatibia in males has a distinct projection apicoventrally, metasomal sternum IV of males is broad and large, sternum V of males with medial triangular projection apically, sternum VII of males with double apical projections, dorsal gonostylar lobe expanded, flattened, and lamelliform mesally and with slender, narrow apical extension; ventral gonostylar bifid apically. Herein, based on the significant differences of the legs, the genus is divided into two subgenera: Maculonomia Wu s. str. and Spanionomia Engel & Tran, n. subgen. (see key to subgenera, infra). The new subgenus is established based on the species Maculonomia elegans (Smith, 1857). The nominate subgenus can be further arranged into two species groups, distinguished largely by the presence or absence of the enameled bands on the metasomal terga apically: colored-banded species (the interrupta group, with 16 species) and non-colored-banded species (the apicalis group, with five species) (Table 1).	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15946BFFEBFC4F3D8CC64A4C87.taxon	description	The female of Maculonomia (Maculonomia) rufomysteria Engel, Tran, & AD Nguyen and the males of M. (M.) ferruginea Engel, Tran, & Nguyen and M. (M.) rufocaudata (Wu, 1988) remain unknown.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15946DFFEAFF673EDFC1584EA0.taxon	type_taxon	TYPE SPECIES. — Nomia terminata Smith, 1875, by original designation.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15946DFFEAFF673EDFC1584EA0.taxon	description	COLORED-BANDS GROUP (INTERRUPTA GROUP)	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15946DFFE5FF7C3FDEC78E4D60.taxon	description	(Figs 1 - 5) urn: lsid: zoobank. org: act: 3 B 92492 F-AF 02 - 4477 - 82 B 8 - 8 BEB 725 C 6704	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15946DFFE5FF7C3FDEC78E4D60.taxon	materials_examined	TYPE MATERIAL. — Holotype. Vietnam • ♂; Bac Kan, Cho Don, Binh Trai, Nam Xuan Lac NR; 22 ° 15 ’ 19.4 ” N, 105 ° 30 ’ 43.7 ” E; alt. 650 m; 15. VIII. 2020; Truong L. X., Nguyen L. T. P., Nguyen C. Q., Tran N. T., Mai T. V., Tran U. T. P. leg.; IEBR. Paratypes. Vietnam • 1 ♀; same data as holotype; IEBR • 2 ♀, 1 ♂; Bac Kan, Cho Don, Binh Trai, Nam Xuan Lac NR; 22 ° 16 ’ 65 ” N, 105 ° 11 ’ 08 ” E; alt. 780 m; 12. VIII. 2020; Truong L. X., Nguyen L. T. P., Nguyen C. Q., Tran N. T., Mai T. V., Tran U. T. P leg.; IEBR • 1 ♀; Bac Kan, Cho Don, Binh Trai, Nam Xuan Lac NR; 22 ° 16 ’ 10 ” N, 105 ° 31 ’ 09 ” E; alt. 827 m; 13. VIII. 2020; Truong L. X., Nguyen L. T. P., Nguyen C. Q., Tran N. T., Mai T. V., Tran U. T. P leg.; AMNH • 1 ♂; Cao Bang, Ha Lang, Duc Quang; 22 ° 43 ’ 12 ” N, 106 ° 39 ’ 21 ” E; alt. 454 m; 21. IX. 2023; Nguyen L. T. P., Nguyen A. D., Tran N. T. leg.; AMNH • 1 ♀; Tuyen Quang, Ham Yen, Yen Thuan, Cao Duong, Cham Chu N. R.; 22 ° 20 ’ 16.4 ” N, 103 ° 51 ’ 09.4 ” E; alt. 670 m; 15. V. 2019; Truong L. X., Nguyen C. Q., Mai T. V. leg.; IEBR • 2 ♀; Tuyen Quang, Ham Yen, Yen Thuan, Cao Duong, Cham Chu NR; 22 ° 20 ’ 16.4 ” N, 103 ° 51 ’ 09.4 ” E; alt. 670 m; 17. V. 2019; Nguyen C. Q., Nguyen L. T. P. leg.; IEBR • 1 ♀, 1 ♂; Lang Son, Huu Lung, Huu Lien, Lan Chau, Huu Lien NR; 21 ° 43 ’ 22.9 ” N, 106 ° 22 ’ 40.2 ” E; alt. 370 m; 12. VI. 2018; Nguyen L. T. P., Truong L. X., Tran N. T., Luong T. V., Nguyen H. T. T. leg.; IEBR • 1 ♀; Hoa Binh, Mai Chau, Hang Kia-Pa Co NR; 20 ° 44 ’ 39 ” N, 104 ° 53 ’ 30 ” E; alt. 1315 m; 19. V. 2022; Nguyen L. T. P., Tran N. T. leg.; IEBR • 7 ♀; Hoa Binh, Kim Boi, Ha Bi, Mo Da; 12 - 14. VI. 2019, Nguyen C. Q. leg.; IEBR.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15946DFFE5FF7C3FDEC78E4D60.taxon	diagnosis	DIAGNOSIS. — This species is most similar to M. planiventris (Friese, 1911) from Taiwan, as in both species the male metafemur has a lamella, parallel to the longitudinal axis of the metafemur, that spans nearly the entire length of the podite, and forms a narrow trough. Unlike M. planiventris, the apical margin of tergum I in both sexes is impunctate (punctate in M. planiventris).	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15946DFFE5FF7C3FDEC78E4D60.taxon	etymology	ETYMOLOGY. — The specific epithet is the Latin noun alveolus, meaning, a “ small trough ”, “ small hollow ”, or “ small channel ”, and refers to the small channel that is formed by the lamella that extends across the metafemur. The name is a noun in apposition.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15946DFFE5FF7C3FDEC78E4D60.taxon	description	DESCRIPTION Male Measurements.. Body length 11.5 - 12 mm (n = 4; holotype = 12 mm). Forewing length 10.5 - 11 mm (n = 4; holotype = 11 mm). Structure. Head broader than long, approximately 1.3 × as broad as long (Fig. 2 A). Compound eyes about 1.4 × genal width. Mandible simple. Clypeus broader than long, approximately 1.5 × as broad as long and apical margin slightly curved. Labrum with triangular process, broader than long, approximately 2.9 × as broad as long and slightly swollen basally (Fig. 2 A). Mesosoma longer than broad, about 1.2 × as long as broad; mesoscutellum with medio-longitudinal depression apically and strongly bigibbous (Fig. 2 B). Forewing with three submarginal cells, first and third submarginal cells broader than second submarginal cell, 1 m-cu entering near apex of second marginal cell (Fig. 1 B). Metafemur swollen, ventral surface with a narrow trough extending along two-thirds length, metatibia gradually expanding toward apex and inner surface with an obvious spine at one-third length from base (Fig. 2 C). Metasomal T 2 half-basally concave (Figs 1 A; 2 D). Metasomal S 4 with deeply emarginate medioapically and bilobed, apical margin of each lobe raised medially (Fig 3 A). S 5 thin basally, apically thickened and with an equilateral triangular process medio-apically (Fig. 3 B). S 6 emarginate medioapically, apical margin as in figure 3 C. S 7 with apical margin broadly and deeply concave, with apicolateral lobes at margins of concavity bearing tufts of elongate setae, minute lobe mesad apicolateral lobe and also with a few long setae (Fig. 3 D). S 8 with broad spiculum and apical margin slightly concave with broad protrudent plate medially (Fig. 3 E). Gonostylus complex, with dorsal and ventral gonostylar lobes (referred to as individual gonostyli – dorsal and ventral – by some authors but the genitalia of Hymenoptera have a single gonostylus on each side, which may then be further subdivided). Dorsal gonostylar lobe expanded, flattened, and lamelliform mesally, with long, slender, apically spatulate process bearing, ventroapical margin with smaller lamella, before tapering to short, slender process (i. e., apex bifid) (Fig. 3 F), with elbowed mesal process proximally with thin, flattened plate apically (Fig. 3 F, G). Ventral gonostylar lobe a thinner process with rounded apex, inner margin curved, outer margin slightly wavy (Fig. 3 G). Sculpturing. Clypeus medially with dense coarse punctures, punctures sparser latero-apically; supraclypeal area with dense, coarse, contiguous punctures; paraocular area with dense, contiguous punctures; scape with small, sparse, shallow punctures; frons with coarse, dense, contiguous punctures (Fig. 2 A); vertex with dense punctures, generally puncture sizes larger and coarser than those on frons, except outer margin of ocellus with shiny, smooth, impunctate area. Mesoscutum with small, dense, round punctures; mesoscutellum with sparse punctures except latero-basally with dense round punctures (Fig. 2 B). Metasomal T 1 with dense (not contiguous), round punctures; metasomal T 2 disc half-basally with small, sparse punctures and larger and denser punctures on remainder, metasomal T 3 - T 6 with small, dense (not contiguous) punctures except relatively sparse medially; marginal zones of T 1 - T 5 basally with small, dense (not contiguous) punctures and smooth, shiny, and impunctate on remainder (Fig. 2 D). Color. Body generally black except mandible ferruginous medially (Fig. 2 A). Forewing relatively hyaline except infumate apically (Fig. 1 B). Metasomal T 2 - T 5 with shiny, pale yellowish-green band apically (Figs 1; 2 D). Pubescence. Clypeus, supraclypeal area, and paraocular area extending from base to lower torular tangent with yellowish, plumose setae; scape with some short, yellowish setae; face above antennal torulus with tufts of long, yellowish, plumose setae (Fig. 2 A); frons and vertex with yellowish setae; gena with yellowish, relatively dense, plumose setae. Pronotum with short, dense, white setae intermixed with longer, yellowish, plumose setae. Pronotal lobe with blackish setae except outer margin with short, dense, whitish, plumose setae (Fig. 1 A). Mesoscutum with short, yellowish setae intermixed with some blackish setae (Fig. 2 B). Mesosoma laterally and ventrally with long, dense, yellowish, plumose setae (Fig. 1 A). Propodeum laterally with tuft of yellowish, plumose setae (Fig. 1). Ventral surfaces of coxae, trochanters, pro- and mesofemora with tufts of yellowish, plumose setae. Outer surfaces of protibia, probasitarsus, mesotibia, and mesobasitarsus with short, yellowish setae and inner surfaces of these podites with bristle-like ferruginous setae. Outer surfaces of metafemur, metatibia, and metabasitarsus with yellowish setae. Inner surfaces of metatibia and metabasitarsus with bristle-like, ferruginous setae. Metasomal T 1 with yellowish setae, T 2 with yellowish setae except some long, blackish setae apically, metasomal T 3 - T 5 with blackish setae (Fig. 1). Female Measurements. Total body length about 10 - 11 mm, forewing length 9.5 - 10 mm (n = 16). Structure. Basically similar as male (vide supra) except usual sex differences (e. g. mandible with preapical tooth, metafemur not swollen, metabasitibial plate present, metabasitarsus compressed) (Figs 4 A; 5 B). Sculpturing. As described for male (vide supra) except punctures of clypeus and mesoscutellum denser (Fig. 5 A, B). Color. As described for male (vide supra) except pale yellowish-green bands on metasomal T 2 - T 4 thinner and metasomal T 5 black (Fig. 5 D). Pubescence. As described for male (vide supra) except outer surface of metatibia with yellowish scopa (Fig. 4 A), metasomal S 2 - S 5 with yellowish setae apically.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159462FFE3FC0D3C7EC02D4D21.taxon	description	(Figs 6; 7)	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159462FFE3FC0D3C7EC02D4D21.taxon	materials_examined	MATERIAL EXAMINED. — Vietnam • 1 ♀; Lao Cai, Bat Xat, Y Ty, way to the red waterfall; 21 ° 23 ’ 03.4 ” N, 105 ° 42 ’ 42.6 ” E; alt. 1586 m; 9. V. 2019; Nguyen L. T. P., Nguyen C. Q. leg.; IEBR • 1 ♀; same data; AMNH • 1 ♀; Son La, Bac Yen, Hang Dong, Hang Dong C village, Ta Xua special-use forest; 21 ° 19 ’ 48 ” N, 104 ° 32 ’ 21 ” E; alt. 1256 m; 24. VIII. 2023; Tran D. D. leg.; IEBR.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159462FFE3FC0D3C7EC02D4D21.taxon	discussion	REMARKS Note that the apical enamel bands of the Vietnamese specimens are distinctly orange rather than the yellow of the Tibetan population. Despite this color variation, the specimens agree in all other respects with the species as characterized from Tibet.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159464FFFFFF523CBEC1AC4D2C.taxon	description	(Figs 8 - 10) urn: lsid: zoobank. org: act: 5782 C 286 - D 12 A- 4 C 72 - 969 B- 430 DCF 01 B 896	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159464FFFFFF523CBEC1AC4D2C.taxon	materials_examined	TYPE MATERIAL. — Holotype. Vietnam • ♂; Lam Dong, Bidoup Nui Ba; 24. IX. 2019; Pham N. T. leg.; IEBR.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159464FFFFFF523CBEC1AC4D2C.taxon	etymology	ETYMOLOGY. — The specific epithet is a combination of the Latin adjectives rūfus, meaning, a “ reddish ”, and mystērius, meaning, “ mysterious ”.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159464FFFFFF523CBEC1AC4D2C.taxon	diagnosis	DIAGNOSIS. — This species superficially resembles M. rufocaudata owing to the overall black coloration combined with abundant reddish orange setae on the apical metasomal terga, as well as the presence of enamel apical bands. Unlike M. rufocaudata, however, the reddish orange setae are restricted to terga V and VI, while in M. rufocaudata the color is extensive across terga III-V. Additionally, in the new species the orange, apical, enamel bands are complete on terga V and VI, and only present as small spots at the extreme lateral portions of tergum IV, rather than the complete bands found in M. rufocaudata on terga III-V. In M. rufocaudata the wing is uniformly yellowed to yellowish brown, often a bit lighter apically beyond the veins. In the new species the forewing is yellow, then paler just beyond the veins before forming a large, apical, infumate spot, resembling somewhat the apical spot of M. terminata. In M. rufocaudata the mesoscutellum is unmodified or with weak paramedial callosities, while in the new species there are prominent elevated tubercles on either side of the midline. Naturally, given that the male of M. rufocaudata is currently unknown it was tempting to consider this male as conspecific with the aforementioned females attributed to M. rufocaudata. We have erred on the side of splitting, however, given the rather prominent habitat differences: M. rufocaudata from mountains in the North of Vietnam and Tibet, versus the more isolated mountain of Bidoup National Park in Central Highlands Vietnam. Moreover, the pattern of wing coloration is quite divergent between the two. Additionally, the punctures of tergum II are smaller and separated by about a puncture width in M. rufocaudata versus the slightly larger punctures distinctly separated by much less than a puncture width in the male described here. Thus, pending the discovery of a male from Tibet or the mountainous populations of northern Vietnam that might indicate otherwise, we consider this Central Highlands male as distinct but obviously closely allied.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159464FFFFFF523CBEC1AC4D2C.taxon	description	DESCRIPTION Male Measurements. Total body length 13.5 mm, forewing length 11.5 mm. Structure. Head broader than long, approximately 1.2 × as broad as long (Fig. 10 A); compound eyes approximately 1.4 × genal width; mandible simple; clypeus slightly convex laterally, approximately 1.3 × as broad as long; supraclypeal area slightly convex (Fig. 9 A). Mesosoma approximately 1.2 × as long as broad; mesoscutellum with mediolongitudinal depression apically and strongly bigibbous (Fig. 9 B). Forewing with three submarginal cells, first and third submarginal cells broader than second submarginal cell, 1 m-cu entering near apex of second marginal cell (Fig. 8 A). Metafemur slightly swollen (Fig. 9 C); metatibia gradually expanding toward apex and inner surface with slightly raised knob at one-third length from base. Metasomal S 4 with deeply, narrowly emarginate medioapically, margin relatively straight and sloping to middle on either side of emargination (Fig. 10 A). S 5 with an isosceles-triangle-shaped process medio-apically, and long thin processes on either side of midline bearing abundant setae (Fig. 10 B). S 6 apical margin emarginate medially, emargination shallow and comparatively narrow, apical margin as in Figure 10 C. S 7 apical margin broadly concave with apicolateral lobes on either side of concavity bearing elongate setae, smaller lobe mesad apicolateral lobes and also with many long setae (Fig. 10 D). S 8 with broad spiculum, apical margin slightly concave with broad medial plate (Fig. 10 E). Dorsal gonostylar lobe expanded, flattened, and lamelliform mesally, apex bifid, with ventral portion long, thin and mesally directed, ventral apical margin with smaller lamella, then narrowed toward apex and round apically with many long setae (Fig. 10 F), with elbowed mesal process proximally with thin, flattened plate apically (Fig. 10 F, G). Ventral gonostylar process narrow with rounded apex, inner margin curved, outer margin strongly wavy (Fig. 10 G). Sculpturing. Clypeus with dense punctures on basal half, sparser, and somewhat wrinkled punctures on remainder; punctures on supraclypeal area denser than those on clypeus; paraocular area with dense punctures on basal half and sparser punctures on remainder; scape with small, sparse punctures (Fig. 9 A); frons with dense, nearly contiguous punctures; vertex with shiny, shallow punctures, punctures sparser than those on frons, except outer margin of median ocellus with shiny, smooth, impunctate area. Mesoscutum and mesoscutellum with dense (not contiguous) round punctures (Fig. 9 B). Disc of metasomal T 1 with round punctures separated by about a puncture width, apical marginal zone broad, with small, dense punctures basally but otherwise impunctate; punctures on discs of T 2 - T 6 smaller and denser than those of T 1, with apical margin zones impunctate except small, dense punctures in basal quarters to thirds (Fig. 9 D). Color. Body black except forewing yellow, then paler just beyond veins before forming a large, apical, darkly infumate spot (Fig. 8 A). Metasomal T 5 - T 6 with shiny, orange bands apically (Figs 8; 9 D, E). Pubescence. Clypeus and supraclypeal area with some blackish, plumose setae; paraocular area from base to lower torular tangent with long, dense, blackish, plumose setae; scape with some blackish setae; face above antennal torulus with tufts of long, yellowish-black to blackish, plumose setae (Fig. 9 A). Mesoscutum covered with dense, soft, blackish, plumose setae; setae of mesoscutellum longer than those on mesoscutum (Fig. 9 B). Propodeum with tuft of blackish, plumose setae laterally. Ventral surfaces of coxae, trochanters, pro- and mesofemora with tufts of soft, blackish, plumose setae. Outer surfaces of tibiae and basitarsi with bristle-like and blackish setae, inner surfaces of metatibia and metabasitarsus with bristle-like and ferruginous setae. Metasomal T 1 - T 4 covered with dense, soft, blackish setae; T 5 - T 6 with reddish-orange setae. Female Unknown. NON-COLORED-BANDS GROUP (APICALIS GROUP)	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159478FFFDFF6F3C5EC13B4DA1.taxon	description	(Figs 11; 12) urn: lsid: zoobank. org: act: AF 92 FDF 2 - A 54 B- 4005 - 9048 - 9 D 295 E 31 DD 10	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159478FFFDFF6F3C5EC13B4DA1.taxon	materials_examined	TYPE MATERIAL. — Holotype. Vietnam • ♀; Lao Cai, Bat Xat, Y Ty, way to the red waterfall; 21 ° 23 ’ 03.4 ” N, 105 ° 42 ’ 42.6 ” E; alt. 1586 m; 9. V. 2019; Nguyen L. T. P., Nguyen C. Q. leg.; IEBR. Paratypes. Vietnam • 1 ♀; same data as holotype; AMNH • 1 ♀; Lao Cai, Sa Pa, Sa Pa town, Cat Cat village; 22 ° 19 ’ 41 ” N, 103 ° 49 ’ 54 ” E; alt. 1264 m; 27. X. 2020; Tran N. T. leg. • 1 ♀; Lao Cai, Sa Pa, Sa Pa town, Cat Cat village; 12. IX. 2023; Mai T. V. leg.; IEBR.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159478FFFDFF6F3C5EC13B4DA1.taxon	etymology	ETYMOLOGY. — The specific epithet is the Latin adjective ferruginea, which refers to the metasomal terga with conspicuously ferruginous setae.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159478FFFDFF6F3C5EC13B4DA1.taxon	diagnosis	DIAGNOSIS. — The female of this new species is similar to the female of M. xiongjiuensis Niu & Zhu, 2017 as they have a similar body form, with black integument and lacking enameled bands on the metasomal terga apically, the mesoscutum and mesoscutellum with black setae, and the forewing with an obvious dark infumation at the apical corner. Unlike M. xiongjiuensis, metasomal T 1 has faint, sparse punctures (metasomal T 1 with relatively coarser, denser punctures in M. xiongjiuensis); antennal F 4 - F 12 reddish brown (antennal F 4 - F 12 black in M. xiongjiuensis); discs of metasomal T 1 - T 5 in lateral view with obvious ferruginous setae (discs of metasomal T 1 - T 2 disc with yellowish-brown setae, T 3 - T 5 with black setae in M. xiongjiuensis).	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159478FFFDFF6F3C5EC13B4DA1.taxon	description	DESCRIPTION Female Measurements. Total body length 12 - 12.5 mm (n = 4; holotype = 12.5 mm), forewing length 11 - 11.5 mm (n = 4; holotype = 11.5 mm). Structure. Head broader than long, about 1.3 × as broad as long (Fig. 12 A); compound eyes about 1.4 × genal width; mandible with short preapical tooth; supraclypeal area medially convex; clypeus convex laterally, approximately 1.5 × as broad as long and apical margin straight (Fig. 12 A). Mesosoma about 1.2 × as long as broad; mesoscutellum round apically (Fig. 12 B). Forewing with first and third submarginal cells broader than second submarginal cell, 1 m-cu entering anterior apex of second marginal cell. Metabasitibial plate triangular, glabrous (Fig. 11 A). Sculpturing. Clypeus with shiny, coarse, wrinkled, dense (not contiguous) punctures; supraclypeal area with dense, contiguous punctures except punctures sparser medioapically; scape with small, sparse punctures; paraocular area with dense, coarse, wrinkled punctures of unequal sizes (Fig. 12 A); frons with dense (not contiguous), round punctures; vertex with dense, wrinkled punctures except outer margin of median ocellus with shiny, impunctate, smooth area. Mesoscutum with dense, small, round punctures of unequal sizes; mesoscutellum as on mesoscutum except punctures laterally and slightly so paramedially (Fig. 12 B). Anterior-facing surface of metasomal T 1 with small, faint, relatively dense punctures except sparser medio-apically; disc of T 1 with small, faint, sparse punctures; apical marginal zone impunctate, faintly imbricate to smooth, with a few sparse punctures scattered at base a slightly more in horizontal rows laterally (Fig. 12 D). Metasomal T 2 - T 4 with faint, relatively sparse punctures except basally with small, round, denser punctures; marginal zones of metasomal T 2 - T 4 with small, round punctures on basal two-thirds, remainder smooth and impunctate (Fig. 12 D). Color. Body black except mandible ferruginous medially (Fig. 12 A). F 4 - F 12 reddish brown ventrally (Fig. 12 A). Forewing yellow to yellowish brown, often a bit lighter apically beyond the veins, obviously dark infumate at apical corner (Fig. 11). Metasomal S 2 - S 5 ferruginous apically. Pubescence. Face with short, sparse, blackish setae. Setae of gena softer and denser than those on face. Pronotum basally and outer margin of pronotal lobe with dense, yellowish setae. Mesosoma dorsally and laterally with dense, blackish setae, mesoscutellum covered with dense, blackish setae; mesosoma ventrally with ferruginous setae. Propodeum laterally with tuft of long, ferruginous setae. Metafemur with ferruginous scopa. Outer surface of metatibia with dense, ferruginous, plumose setae. Outer surface of metabasitarsus with bristle-like, ferruginous setae. Inner surfaces of metatibia and metabasitarsus with short, bristle-like, bright-ferruginous setae. Anterior-facing surface of metasomal T 1 and discs of T 1 - T 5 in lateral view with obvious ferruginous setae. Metasomal S 2 - S 5 with bright ferruginous setae apically. Male Unknown.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E159478FFFDFF6F3C5EC13B4DA1.taxon	discussion	REMARKS At first glance the new species can easily be confused if placed among specimens of M. terminata and indeed we encountered them while entering data for M. terminata. However, the species, although seemingly cryptic, has sufficient differentiating factors to validate it as a new species.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15947AFFF9FF603D3DC7444C21.taxon	description	(Figs 13 - 17)	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15947AFFF9FF603D3DC7444C21.taxon	materials_examined	MATERIAL EXAMINED. — Vietnam • 1 ♀, 1 ♂; Bac Kan, Cho Don, Binh Trai, Nam Xuan Lac NR; 22 ° 16 ’ 65 ” N, 105 ° 11 ’ 08 ” E; alt. 780 m; 12. VIII. 2020; Truong L. X., Nguyen L. T. P., Nguyen C. Q., Tran N. T., Mai T. V., Tran U. T. P leg.; IEBR • 1 ♀, 1 ♂; same data; AMNH • 1 ♀, 4 ♂; Bac Kan, Cho Don, Binh Trai, Nam Xuan Lac NR; 22 ° 16 ’ 10 ” N, 105 ° 31 ’ 09 ” E; alt. 827 m; 13. VIII. 2020; Truong L. X., Nguyen L. T. P., Nguyen C. Q., Tran N. T., Mai T. V., Tran U. T. P leg.; IEBR • 3 ♀; Bac Kan, Cho Don, Binh Trai, Nam Xuan Lac NR; 22 ° 15 ’ 19.4 ” N, 105 ° 30 ’ 43.7 ” E; alt. 650 m; 15. VIII. 2020; Truong L. X., Nguyen L. T. P., Nguyen C. Q., Tran N. T., Mai T. V., Tran U. T. P leg.; IEBR • 1 ♀; Vinh Phuc, Phuc Yen, Ngoc Thanh, Me Linh Biodiversity Station; 12. VI. 2018; Pham P. H. leg.; IEBR • 1 ♀; Vinh Phuc, Phuc Yen, Ngoc Thanh, Me Linh Biodiversity Station; 22 ° 47 ’ 36 ” N, 104 ° 36 ’ 44 ” E; alt. 63 m; 1, 2. VII. 2020; Tran N. T., Mai T. V. leg.; IEBR • 1 ♀; Vinh Phuc, Tam Dao, Tam Dao town; 26. V. 2013; Dang H. T. • 2 ♂; Vinh Phuc, Tam Dao, Tam Dao town; 23 ° 02 ’ 49.0 ” N, 104 ° 59 ’ 35.6 ” E; alt. 882 m; 28. X. 2016; Tran N. T., Nguyen M. P., Luong T. V. leg.; IEBR • 8 ♀; Lang Son, Huu Lung, Huu Lien, Lan Nghe, Huu Lien NR; 21 ° 33 ’ 48.6 ” N, 106 ° 24 ’ 36.4 ” E; alt. 289 m; 11. VI. 2018; Nguyen L. T. P., Truong L. X., Tran N. T., Luong T. V., Nguyen H. T. T. leg.; IEBR • 4 ♀, 1 ♂; Lang Son, Huu Lung, Huu Lien, Lan Chau, Huu Lien NR; 21 ° 43 ’ 22.9 ” N, 106 ° 22 ’ 40.2 ” E; alt. 370 m; 12. VI. 2018; Nguyen L. T. P., Truong L. X., Tran N. T., Luong T. V., Nguyen H. T. T. leg.; IEBR • 3 ♀; Lang Son, Huu Lung, Huu Lien, Huu Lien NR; 21 ° 43 ’ 29.1 ” N, 106 ° 22 ’ 31.1 ” E; alt. 257 m; 13. VI. 2018; Nguyen L. T. P., Truong L. X., Tran N. T., Luong T. V., Nguyen H. T. T. leg.; IEBR • 3 ♀; Lang Son, Huu Lung, Huu Lien NR; 12. VI. 2019; Nguyen L. T. P., Dang H. T., Tran N. T., Bogdan leg.; IEBR • 1 ♀; Lang Son, Huu Lung, Huu Lien, La Ba; 13. VI. 2019; Nguyen .. L. T. P., Dang H. T., Tran N. T., Bogdan leg.; IEBR • 3 ♀; Lang Son, Huu Lung, Cai Kinh; 20 ° 31 ’ 37.6 ” N, 105 ° 00 ’ 24.2 ” E; alt 86 m; 16. VII. 2016; Nguyen L. T. P., Nguyen D. D., Tran N. T leg.; IEBR • 1 ♂; Lang Son, Loc Binh, Mau Son; 1. XI. 2014; Nguyen D. D., Nguyen L. T. P., Nguyen M. P. leg.; 1 ♀; Tuyen Quang; 21 ° 46 ’ 50.8 ” N, 105 ° 28 ’ 50.6 ” E; alt. 107 m; 2. IV. 2018; Nguyen L. T. P. leg.; IEBR • 2 ♀; Tuyen Quang, Ham Yen, Phu Luu, Nam Nuong, Cham Chu NR; 22 ° 12 ’ 39 ” N, 105 ° 03 ’ 06 ” E; alt. 74 m; 29. X. 2018; Nguyen L. T. P., Nguyen C. Q., Luong T. V. leg.; IEBR • 2 ♀, 1 ♂; Tuyen Quang, Ham Yen, Cao Duong, Yen Thuan; 22 ° 17 ’ 41.9 ” N, 104 ° 59 ’ 18.4 ” E; alt. 523 m; 15. V. 2019; Nguyen L. T. P., Tran N. T. leg.; IEBR • 1 ♀; Cao Bang, Nguyen Binh, Phia Oac-Phia Den NP; 23 ° 02 ’ 49 ” N, 104 ° 59 ’ 35.6 ” E; alt. 1592 m; 5. XI. 2016; Tran N. T., Nguyen M. P., Luong T. V. leg.; IEBR • 1 ♀; Cao Bang, Nguyen Binh, Phia Oac-Phia Den NP; 22 ° 35 ’ 03 ” N, 105 ° 51 ’ 40 ” E; alt. 944 m; 9. VI. 2020; Truong L. X., Nguyen L. T. P., Nguyen C. Q., HD Nguyen, Tran N. T., Mai T. V., Tran U. T. P leg.; IEBR • 5 ♀; Cao Bang, Nguyen Binh, Phia Oac-Phia Den NP; 22 ° 35 ’ 28 ” N, 105 ° 51 ’ 21 ” E; alt. 997 m; 2. VII. 2022, Tran N. T. leg.; IEBR • 2 ♀; Cao Bang, Tra Linh, Thang Hen lake; 22 ° 45 ’ 47.5 ” N, 106 ° 17 ’ 35.7 ” E; alt. 619 m; 20. V. 2023; Nguyen L. T. P., Tran N. T., Nguyen C. Q. leg.; IEBR • 3 ♂; Cao Bang, Tra Linh, Thang Hen lake; 22 ° 45 ’ 46.7 ” N, 106 ° 17 ’ 36.3 ” E; alt. 593 m; 18. IX. 2023; Nguyen L. T. P., Nguyen A. D., Tran N. T. leg.; IEBR • 6 ♂; Cao Bang, Ha Lang, Dong Loan, near bat cave; 22 ° 44 ’ 50.0 ” N, 106 ° 44 ’ 44.4 ” E; alt. 405 m; 20. IX. 2023; Nguyen L. T. P., Tran N. T. leg.; IEBR • 2 ♀, 2 ♂; Cao Bang, Ha Lang, Duc Quang; 22 ° 43 ’ 11.8 ” N, 106 ° 39 ’ 21.0 ” E; alt. 454 m; 21. IX. 2023; Nguyen L. T. P., Nguyen A. D., Tran N. T. leg.; IEBR • 1 ♀; Yen Bai, Tan Phuong, Khe Bin; 22 ° 15 ’ 51.3 ” N, 104 ° 38 ’ 07 ” E; alt. 500 m; 7. IX. 2017; Nguyen L. T. P., Nguyen C. Q., Vu T. T. T. leg.; IEBR • 1 ♀; Yen Bai, Van Yen, Na Hau; 21 ° 47 ’ 1 ” N, 104 ° 47 ’ 48.1 ” E; alt. 500 m; 9. IX. 2017; Nguyen L. T. P., Truong L. X., Vu T. T. T. leg.; IEBR • 1 ♂; Ha Giang, Bac Me, Lung Cang; 22 ° 43 ’ 17.1 ” N, 105 ° 11 ’ 43.8 ” E; alt. 219 m; 20. VII. 2019; Nguyen C. Q., Dang HT, Mai T. V. leg.; IEBR • 1 ♀; Phu Tho, Yen Lap, Dong Thinh; 12 ° 19 ’ 27 ” N, 105 ° 03 ’ 35 ” E; 1. XII. 2015; Nguyen L. T. P., Truong L. X., Nguyen D. D., Tran N. T. leg.; IEBR • 3 ♂; Ninh Binh, Nho Quan, Cuc Phuong NP, Botanical gardens; 8. VIII. 2019; Nguyen L. T. P., Nguyen C. Q. leg.; IEBR • 4 ♂; Ninh Binh, Nho Quan, Cuc Phuong NP; 21. VIII. 2023; Nguyen L. T. P., Nguyen A. D., Tran N. T., Engel M. S. leg.; IEBR • 4 ♂; Ninh Binh, Nho Quan, Cuc Phuong NP, way to Cho Chi; 22. VIII. 2023; Nguyen L. T. P., Nguyen A. D., Tran N. T., Engel M. S. leg.; IEBR • 1 ♀; Hanoi, Ba Vi, Ba Trai; 9. VII. 2017; Nguyen L. T. P., Luong T. V. leg.; IEBR • 1 ♂; Thanh Hoa, Thuong Xuan, Van Xuan, Hon Cao, Xuan Lien NR; 19 ° 51 ’ 41.2 ” N, 105 ° 14 ’ 06.6 ” E; alt. 175 m; 27. VIII. 2012; Nguyen L. T. P. leg.; IEBR • 1 ♀; Nghe An, Que Phong, Thong Thu; 19 ° 47 ’ 24.6 ” N, 104 ° 59 ’ 45.6 ” E; alt. 300 m; 21. IV. 2016; Nguyen L. T. P., Truong L. X., Nguyen D. D. leg.; IEBR • 4 ♀; Nghe An, Con Cuong, Thac Kem, Pu Mat NP; 22 ° 47 ’ 36 ” N, 104 ° 36 ’ 44 ” E; alt. 280 m; 30. VIII. 2020; Tran N. T. leg.; IEBR • 1 ♂; Thua Thien Hue, A Luoi, A Roang; alt.> 700 m; 21. VII. 2004; ISD leg.; IEBR • 1 ♀; Quang Nam, Phuoc Son, Phuoc Xuan; alt. 300 m; 31. VII. 2004; ISD leg.; IEBR • 5 ♀; Kon Tum, Kon Plong, Dak Long, Pa Sy waterfall; 14 ° 36 ’ 02.6 ” N, 108 ° 15 ’ 24.2 ” E; alt. 1104 m; 30. IV. 2016; Nguyen L. T. P., Nguyen D. D., Tran N. T. leg.; IEBR • 4 ♀; Gia Lai, KBang, Son Lang, Kon Chu Rang NR, near Dam Ranger Station; 14 ° 28 ’ 57.9 ” N, 108 ° 30 ’ 59.8 ” E; alt. 860 m; 27. IV. 2016; Nguyen L. T. P., Nguyen D. D., Tran N. T. leg.; IEBR • 1 ♂; Gia Lai, KBang, Son Lang, Kon Chu Rang NR; 19. IX. 2017; Nguyen L. T. P. et al. leg.; IEBR • 2 ♀; Gia Lai, KBang, Son Lang, Kon Chu Rang NR; 14 ° 31 ’ 12.7 ” N, 108 ° 28 ’ 11.3 ” E; alt. 896 m; 4. V. 2018; Nguyen L. T. P., Truong L. X., Luong T. V. leg.; IEBR • 5 ♀; Gia Lai, KBang, Son Lang, Kon Chu Rang NR; 14 ° 43 ’ 48.9 ” N, 108 ° 29 ’ 22.2 ” E; alt. 866 m; 5. V. 2018; Nguyen L. T. P., Truong L. X., Luong T. V. leg.; IEBR • 1 ♀; Gia Lai, KBang, Son Lang, Kon Chu Rang NR; 14 ° 31 ’ 10.4 ” N, 108 ° 36 ’ 24.9 ” E; 6. IX. 2018; Luong T. V., Truong L. X. leg.; IEBR • 5 ♀; Gia Lai, KBang, Kon Chu Rang NR; 10. IX. 2018; Luong T. V. leg.; IEBR • 2 ♂; Gia Lai, KBang, Son Lang, Kon Chu Rang NR, way to Koncle; 23. IX. 2018; Nguyen L. T. P., Nguyen C. Q., Vu T. T. T., Luong T. V. leg.; IEBR • 1 ♀; Gia Lai, KBang, Dak Rong; 14 ° 28 ’ 55.7 ” N, 108 ° 29 ’ 57.6 ” E; alt. 1140 m; 28. IV. 2016; Nguyen L. T. P., Nguyen D. D., Tran N. T. leg.; IEBR • 1 ♀; Gia Lai, KBang, Son Lang, Ha Lam; 29. IV. 2016; Nguyen L. T. P., Nguyen D. D., Tran N. T. leg.; IEBR • 1 ♀; Dak Lak, Krong Bong, Krong Kmar, Chu Yang Sin NP; 12 ° 26 ’ 0.07 ” N, 108 ° 22 ’ 22.9 ” E; alt. 822 m; 3. V. 2016; Nguyen L. T. P., Nguyen D. D., Tran N. T. leg.; IEBR • 6 ♀; Dak Lak, Krong Bong, Krong Kmar, Chu Yang Sin NP; 12 ° 25 ’ 02.8 ” N, 108 ° 22 ’ 30.8 ” E; alt. 1081 m; 4. V. 2016; Nguyen L. T. P., Nguyen D. D., Tran N. T. leg.; IEBR • 3 ♀; Dak Lak, Krong Bong, Krong Kmar, Chu Yang Sin NP; 12 ° 24 ’ 33.8 ” N, 108 ° 21 ’ 08.8 ” E; alt. 819 m; 8. V. 2018; Nguyen L. T. P., Truong L. X., Luong T. V. leg.; IEBR.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15947AFFF9FF603D3DC7444C21.taxon	diagnosis	DIAGNOSIS. — This species is most distinctive for its characteristic squarish lamella projecting from the ventral base of the male metafemur. In addition, the body is largely covered with fulvous setae; the head and mesosoma are densely punctured; the flagellum is fulvous ventrally except the basal three flagellomeres; the tegula is largely rufo-testaceous; the forewing membrane has a dark-infuscate mark extending from the marginal cell apex; the metasoma is black, the terga lack enameled bands, and the terga are largely smooth and shining amid coarse discal punctures and small, fine punctures on basal halves of broad marginal zones (apical halves impunctate) except T 1 of female with punctures noticeably weaker and sparser. The Vietnamese populations all belong to the subspecies M. terminata terminata [M. terminata megaera (Gribodo, 1894) is found in Singapore and Indonesia].	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15947AFFF9FF603D3DC7444C21.taxon	discussion	REMARKS Maculonomia terminata is exceptionally common in the northern and central highlands of Vietnam. This species is found across a broad elevational zone, ranging from a few dozen meters to 1600 meters.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15947EFFF8FC123DBDC24B4C86.taxon	type_taxon	TYPE SPECIES. — Nomia elegans Smith, 1857.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15947EFFF8FC123DBDC24B4C86.taxon	etymology	ETYMOLOGY. — The new subgeneric name is a combination of the Ancient Greek adjective σπᾰ ́ νῐΟς (spánios), meaning, “ sparse ” or “ rare ”, and the generic name Nomia Latreille. The gender of the name is feminine.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
03BA0E15947EFFF8FC123DBDC24B4C86.taxon	diagnosis	DIAGNOSIS. — This subgenus is quite distinctive from all other Maculonomia for the comparatively sparse setation of the metatibial scopa and the light coloration of the legs, which are also rather thin in the male, and with scarcely any apical lobe present on the metatibia (versus the well-developed lobes of Maculonomia s. str.). Aside from the type species the subgenus also includes Maculonomia concinna Smith, 1860.	en	Tran, Ngat Thi, Phuong, Lien Thi, Anh, Phuong Nguyen, Nguyen, Anh Duc, Engel, Michael S. (2025): New species and records of the nomiine bee genus Maculonomia Wu, 1982 from Vietnam (Hymenoptera, Halictidae). Zoosystema 47 (4): 51-73, DOI: 10.5252/zoosystema2025v47a4, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2025v47a4.pdf
