Mascaromyia rochati, 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 : 203-205

Mascaromyia rochati sp. n.

( Figs 8−14 )

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

Description. Male ( Fig. 8 ). Head ( Fig. 9 ). Hair-like front vertical seta bends forward; face silvery white; eyes nearly contiguous in middle of face; antenna ( Fig. 10 ) slightly shorter than height of head, black; scape simple; pedicel with ring of short setulae and one dorsal seta longer than pedicel; postpedicel slightly longer than high at base (13/11), triangular, with acute apex, pubescent; stylus basodorsal, short haired; length (mm) of scape, pedicel, postpedicel, stylus (segments 1 and 2), 0.8: 0.06: 0.13: 0.1: 0.68.

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 dirty yellow; mid and hind coxae black; fore tarsus brownish from middle of basitarsus; mid tarsus brown from tip of basitarsus; hind femur brown in distal third and dorsally in middle third, hind tibia progressively brown distally; hind tarsus brown-black; fore coxa anteriorly with yellow hairs, one short and one long black apical setae, ending with a long thin whitish yellow thorn; mid coxa with yellow outer hairs and small brush of yellow hairs at tip anteriorly; hind coxa with one long black external seta; legs thin, with weak setae; femora without remarkable ciliation ventrally; fore tarsus ( Fig. 12 ) simple, with basitarsus thin and long, rest segments shortened; mid tibia with one anterodorsal and two posterodorsal setae; tarsus simple; hind tibia with 4−5 dorsals in middle and few rather small ventral setae; tarsus simple; basitarsus with short basoventral seta; femur, tibia and tarsomere (from first to fifth) length ratio (mm): fore leg: 1.05: 1.12: 1.29: 0.13: 0.1: 0.08: 0.1, mid leg: 1.23: 1.99: 1.3: 0.38: 0.3: 0.18: 0.11, hind leg: 1.73: 2.37: 0.84: 0.5: 0.34: 0.21: 0.13.

Wing ( Fig. 13 ) long and narrow, evenly grey; veins brown; ratio of costal section between R 2 + 3 and R 4 + 5 to that between R 4 + 5 and M 1, 0.35: 0.05; ratio of crossvein dm-cu to apical part of M 1 + 2 (fork-handle) to apical part of M 4, 0.37: 0.62: 0.25; 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, 1 pair of yellow and 2 pairs of black long marginal setae; other tergites with short dark hairs and short black setae; 7 th abdominal segment and hypopygium ( Fig. 14 ) black; 7 th segment with short sparse hairs; 8 th segment with several long setae; phallus simple; cercus brown-black, swollen at middle, with acute apex, dorsally and laterally setose, with light hairs and two dirty yellow ventral projections of equal length; distal projection bearing two long setae at middle, three apical seta, i.e. long hooked flattened seta, long simple flattened seta and short simple pedunculate seta; basal projection strongly curved, broad, bifurcated, with two leaf-like lobes in apical half; surstylus black, with short narrow subapical process and three long apical setae; epandrial lobe finger-like, with three apical setae.

Measurements (mm): body length 4.5; antenna length 0.9; wing length 3.3; wing width 1.1.

Female unknown.

Diagnosis. Mascaromyia rochati sp. n. belongs to the leptogaster group of species [Grichanov, 2017], being close to M. frolovi from Mauritius, which differs from the new species in fore basitarsus 2 times as long as rest tarsomeres; cercus with acute apex, with long thin basoventral projection, and with apicoventral appendix directed basally and bearing a long basal outer seta, two apical spatulate bristles [ Grichanov, 1996].

Distribution. Mauritius.

Etymology. The species name is dedicated to Dr J. Rochat (the Museum of Natural History of La Réunion, Réunion Island, France).

Figures

Figs 8–14. Mascaromyia rochati sp. n., male. 8 – habitus; 9 – head; 10 – antenna; 11 – fore femur and tibia; 12 – fore tarsus; 13 – wing; 14 –hypopygium after maceration, lateral view, transmitted light. Рис. 8–14. Mascaromyia rochati sp. n., самец. 8 – общий виΑ; 9 – гоΛова; 10 – усик; 11 – переΑнее беΑро и гоΛень; 12 – переΑняя Λапка; 13 – крыΛо; 14 – гипопигий посΛе размачивания, виΑ сбоку, прохоΑящий свет.