Drymeia aristata, Sorokina, Vera S. & Pont, Adrian C., 2015

Sorokina, Vera S. & Pont, Adrian C., 2015, A review of the genus Drymeia Meigen, 1826 (Diptera: Muscidae) in Russia, Zootaxa 4000 (2), pp. 151-206 : 161-164

Drymeia aristata sp. nov.

Figs. 2 A–G

Diagnosis. The species is similar to D. brumalis ( Rondani, 1866) . Males of the new species can be distinguished as follows: anepimeron and katepimeron bare; proboscis thin, elongate; eye bare; fronto-orbital plates touching; facial edge not projecting forward beyond the level of profrons; arista pubescent, the longest hairs slightly longer than basal diameter of arista; abdomen with brownish dust, tergites 3–5 each with a narrow undusted median vitta; mid and hind femora with rows of long, dense, fine posteroventral and ventral setae.

Etymology. The species name refers to the pubescent arista.

Type material examined. Holotype male, RUSSIA: Khakasiya, Shirinskii raion, environs of Shira-Itkul’ lake, 54.45ºN 90.18ºE, tophill Betuletum, 25–28.vi.2011, K. Tomkovich ( ZMUM).

Paratypes: 3 males, same data as holotype ( ZMUM & SZMN); 1 male, Khakasiya, Shirinskii raion, environs Shira salt lake, 350–355 m, 54.48ºN 90.17ºE, 21–24.vi.2011, K. Tomkovich ( ZMUM).

Description. MALE. Length of body, 5.1 mm. Length of wing, 4.3 mm.

Head: Ground-colour black. Eye bare. Fronto-orbital plate brownish-grey pruinose, parafacial grey-silver pruinose; face grey, gena and lower occiput brownish-grey pruinose. Fronto-orbital plates touching. Frons at narrowest point 1.5 times as wide as diameter of anterior ocellus. Ocellar setae short. 10–14 pairs of frontal setae, including interstitials, reaching to anterior ocellus. Antenna black, postpedicel circa 1.5 times as long as wide. Arista swollen in basal sixth, pubescent, the longest hairs slightly longer than basal diameter of arista. Parafacial at level of insertion of arista as wide as width of postpedicel, narrowing below. Upper part of face with a small carina between antennal bases. In lateral view, facial edge not projecting forward beyond the level of profrons. Gena broad, depth below lowest eye-margin equal to length of postpedicel, densely setose and with a group of upcurved setae on anterior part of genal dilation. Palpus black. Proboscis thin, elongate. Prementum of proboscis dusted, as long as palpus.

Thorax: Ground-colour black. Scutum matt, black, subshining, viewed from in front uniformly brown dusted, with only a small triangular undusted spot in front of scutellum, viewed from behind blackish; postpronotal lobe, notopleuron and postalar callus dusted as scutum. Ground-setulae short. Pleura brown dusted, slightly shining, without a distinct shining patch anteriorly on katepisternum and medially on meron. Anepimeron and katepimeron bare. Notopleuron setulose. Prosternum bare. Acrostichals 0+1. Dorsocentrals 2+3(4). Prealar long and strong. Katepisternal setae 1+1. Scutellum black, shining in posterior view, with small dusted spots on lateral margins and at tip.

Legs: Black. Fore tibia with 2 posteroventral setae on apical half. Fore tarsomeres 1–4 each without fine anteroventral and posteroventral hairs at tip, fore tarsomere 1 without posteroventrals at apex. Fore claws of all males blunt and much shorter then length of tarsomere 5, probably broken. Pulvilli as long as tarsomere 5. Mid femur straight, with rows of long, dense, fine anteroventral, ventral and posteroventral setae; with 0 anterior and 2(3) posterodorsal to posterior preapical setae. Mid tibia with 1–2 anterodorsals on apical half, without anteroventrals; 4 posterodorsals, 2–3 posteroventrals. Hind femur with rows of long, dense, fine ventral and posteroventral setae and with a row of longer and stronger anteroventral setae. Hind tibia with rows of long anterodorsals and posterodorsals, with numerous setae on anterior surface, with 4–5 short hair-like anteroventrals and posteroventrals; with a small ventral apical prong, without posteroventral apical seta but with 1 anteroventral at the tip. Hind tarsomere 1 with 2 short ventral setae at base.

Wing: Brown, darker at base. Basicosta and tegula black. Costa with weak spinules, without costal spine. Cross-vein r-m below the point where subcosta enters costa. Cross-vein dm-cu upright, almost straight, forming a right-angle with vein M. Calypters and margins yellow. Knob of haltere black.

Abdomen: Conical; ground-colour black. Densely brownish dusted, viewed from behind tergites 3–5 with a narrow undusted median vitta. Sternite 1 bare or with several setulae. Sternite 5 ( Fig. 2 D).

Terminalia : Figs 2 E–G.

FEMALE: Not known, but probably similar to D. firthiana (Huckett) and D. triseta sp. nov.

Distribution. Russia: Khakasiya.

Figures

FIGURE 2. Drymeia aristata (paratypes), male. A. Habitus, lateral view. B. Head, anterior view. C. Abdomen, dorsal view. D. Sternite 5. E – G. Terminalia. E. Lateral view. F. Postero-lateral view. G. Posterior view.