Mascaromyia courtoisi, Grichanov, 2020

Grichanov, I. Ya., 2020, Two new species of Mascaromyia Bickel, 1994 (Diptera: Dolichopodidae) from Mauritius Island, Caucasian Entomological Bulletin (Caucas. entomol. bull.) 16 (2), pp. 201-205 : 202

Mascaromyia courtoisi sp. n.

( Figs 1−7 )

Material. Holotype, ♂ ( NMSA): Mauritius, Le Pouce Mnt., UV light trap, 17.09.1963 (C.M. Courtois) . Paratype: 1♂ ( NMSA), same data .

Description. Male ( Fig. 1 ). Head ( Fig. 2 ). Hair-like front vertical seta bends forward; face silvery white; eyes contiguous in middle of face; antenna( Fig. 3 ) slightly shorter than height of head, black; scape simple, elongated; pedicel with ring of short setulae and 1 dorsal seta longer than pedicel; postpedicel slightly longer than high at base (13/10), triangular, with acute apex, pubescent; stylus basodorsal, short haired; length (mm) of scape, pedicel, postpedicel, stylus (segments 1 and 2), 0.11: 0.06: 0.13: 0.12: 0.94.

Thorax.Mesonotum dark bluish-green, grey pollinose, pleura brown-black with bronze-blue reflection, densely grey pollinose; metaepimeron black; five strong dorsocentral setae with a stiff hair in front of the 1 st one; scutellum with two strong setae and two very short lateral marginal hairs.

Legs mostly yellow; mid and hind coxae brown; 5 th segment of fore tarsus deep black; mid tarsus brown from tip of basitarsus; hind femur brown dorsally in distal half, hind tibia progressively brown distally; hind tarsus black; fore coxa anteriorly with yellow hairs, one short black and one long golden apical setae, ending with a long thick whitish yellow worm-like thorn; mid coxa with two yellow apical setae anteriorly; hind coxa with one long black outer seta; legs thin, with weak setae; fore femur ( Fig. 4 ) with ventral row of mainly black fine bristles decreasing in length distally, with basal bristle yellow-brown, 1.5−2 times longer than femur height, 2 nd and 3 rd bristles slightly longer than femur height; fore tibia and basitarsus with regular ventral pectination; 5 th tarsomere widened and dorsoventrally flattened, slightly longer than wide; mid femur with ventral row of white hairs; mid tibia with one anterodorsal and two posterodorsal setae, with few small ventrals; tarsus simple; hind tibia with one anterodorsal at basal 1/4, three dorsal and three rather small ventral setae; tarsus simple; basitarsus with short basoventral seta; femur, tibia and tarsomere (from first to fifth) length ratio (mm): fore leg: 1.25: 1.34: 1.35: 0.47: 0.51: 0.33: 0.14, mid leg: 1.4: 2.24: 1.81: 0.52: 0.44: 0.21: 0.17, hind leg: 1.84: 2.82: 1.01: 0.66: 0.44: 0.28: 0.14.

Wing ( Fig. 5 ) long and narrow, almost hyaline; veins brown; right wing of holotype with posterior stump vein on elbow of M 1; ratio of costal section between R 2 + 3 and R 4 + 5 to that between R 4 + 5 and M 1 + 2, 0.4: 0.1; ratio of crossvein dm-cu to apical part of M 1 + 2 (fork-handle) to apical part of M 4, 0.41: 0.77: 0.32; lower calypter dark-yellow, with black edging and yellow cilia; halter dirty yellow .

Abdomen thin, greenish black, weakly shining; 1 st tergite black; unmodified segments combined about 2.5 times as long as mesonotum; sternites with short sparse light hairs, brown; 1 st tergite with long light hairs and 2 pairs of black marginal setae; other tergites with short light and dark hairs and short black setae; 7 th abdominal segment and hypopygium ( Figs 6, 7 ) black; 7 th segment short, as long as 6 th segment, with short sparse hairs; 8 th segment with several long setae; epandrium rounded, as long as 7 th segment, strongly sclerotized, projected distally; phallus with dorsal tooth; cercus swollen in basal 1/3, with long and narrow distal part covered with short hairs, numerous dorsal and ventral setae and two long apical setae, with two large basoventral projections of unequal length; distal projection rounded, bearing two very long setae distally and long process having three spatulate setae; basal projection bifurcated, with shorter distal arm and long and strongly curved proximal arm reaching ventral side of epandrium; distal arm of basal projection bearing long thick seta and ovate process at apex; proximal arm of basal projection leaf-like in apical half; surstylus black, subquadrate, with several short apical setae; epandrial lobe small, subtriangular, bearing three short setae.

Measurements (mm). Body length 4.9; antenna length 1.1; wing length 4.1; wing width 1.2.

Female unknown.

Diagnosis. Mascaromyia courtoisi sp. n. belongs to the leptogaster group of species [Grichanov, 2017], being close to M. loici Grichanov, 2003 from Réunion, which differs from the new species in fore tarsus with yellow 5 th segment; fore femur with 1−2 fine ventral setae at base; cercus shorter than epandrium, semiglobular, strongly swollen, with short, nearly right-angular apex [ Grichanov, 2003].

Distribution. Mauritius.

Etymology. The species name is dedicated to its collector, C.M. Courtois.

Figures

Figs 1–7. Mascaromyia courtoisi sp. n., male. 1 – habitus; 2 – head; 3 – antenna; 4 – fore femur and tibia; 5 – wing; 6 – hypopygium after maceration, lateral view, reflected light; 7 – hypopygium after maceration, lateral view, transmitted light. Рис. 1–7. Mascaromyia courtoisi sp. n., самец. 1 – общий виΑ; 2 – гоΛова; 3 – усик; 4 – переΑнее беΑро и гоΛень; 5 – крыΛо; 6 – гипопигий посΛе размачивания, виΑ сбоку, отраженный свет; 7 – гипопигий посΛе размачивания, виΑ сбоку, прохоΑящий свет.