Drymeia cilitarsis, 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 : 165-167

Drymeia cilitarsis sp. nov.

Figs. 4 A–G

Diagnosis. The species is close to species of the D. cinerea group (the former genus Bebry x Gistl), which all have the anepimeron setulose ( D. cinerea ( Meigen, 1826) , D. caucasica (Schnabl & Dziedzicki, 1911) , D. sibirica (Hennig, 1962) and D. chillcotti (Huckett, 1965)) . Males of the new species can be distinguished as follows: prealar absent; anepimeron haired, katepimeron bare or with few hairs; proboscis thin, elongate; eye with very short sparse hairs; fronto-orbital plates touching; tip of abdomen with a dense brush of slender black setulae and bristles, caudally directed; mid femur weakly curved and flattened ventrally, with only a few short anteroventral setae on apical third; hind femur without posteroventral setae; hind tibia with a small ventral apical prong, without posteroventral apical seta.

Etymology. The species name is based on the Latin words “cilium” and “tarsus” on account of the short fine anteroventral and posteroventral hairs at the tips of fore tarsomeres 1–4.

Type material examined. Holotype male, RUSSIA: Altai Republic, Kosh-Agachskii raion, north slope of Severo-Chuyskii range, valley of Akturu River, 2014 m, 50º06'N 87º48'E, 21.vii.2013, V. Sorokina ( SZMN).

Paratypes: 1 male, same data as holotype ( SZMN); 2 males, Tyva Republic, Morgun-Taiginskii kozhuun, environs of Mugur-Aksy, 2000–2100 m, ~ 50º22'N 90º25'E, 22.vii.1993, A. Barkalov ( SZMN).

Description. MALE. Length of body, 7.8–8.5 mm. Length of wing, 5.2–6.0 mm.

Head: Ground-colour black. Eye with very short sparse hairs. Fronto-orbital plate and parafacial silvery-white pruinose; face grey, gena and lower occiput light grey pruinose. Fronto-orbital plates touching. Frons at narrowest point as wide as diameter of anterior ocellus. Ocellar setae quite short. 17–18 pairs of frontal setae, including interstitials, reaching almost to anterior ocellus. Antenna black, postpedicel 1.5 times as long as wide. Arista swollen in basal sixth, appearing almost bare, the longest hairs shorter than its basal diameter. Parafacial at level of insertion of arista slightly narrower than or equal to width of postpedicel, hardly narrowing below. Upper part of face with a small knob or 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 or slightly broader than length of postpedicel, densely setose and with a group of upcurved setae on anterior part of genal dilation. Palpus black. Proboscis thin, elongate, prementum dusted.

Thorax: Ground-colour black. Scutum matt, black, viewed from in front with two green-grey vittae running inside the line of the dorsocentrals but not reaching scutellum, postpronotal lobe and notopleuron light grey dusted. Ground-setulae long and dense. Pleura grey dusted, with a shining patch anteriorly on katepisternum and medially on meron. Acrostichals 0+1, the presutural setulae in 4–5 irregular rows. Dorsocentrals 2+4. Prealar absent. Notopleuron densely setulose. Prosternum bare. Anepimeron haired. Katepimeral setae 1+1, otherwise without or with a few hairs. Scutellum black and dusted in posterior view.

Legs: Black. Fore tibia with 2–4 posteroventral setae on apical half. Fore tarsomeres 1–4 each with a short fine anteroventral and posteroventral hair at tip, and tarsomere 1 with rows of such hairs, without posteroventrals at apex. Fore claws as long as length of tarsomere 5, thin and pointed, but often short, blunt and obviously broken, shorter than length of tarsomere 5. Pulvilli as long as tarsomere 5. Mid femur curved and flattened ventrally, with only a few short anteroventral setae on apical third, none as long as femoral depth; anterior surface with a row of long setae on basal half and some strong but short setae near to anterodorsal surface; posteroventral surface with row of very short fine setae that become longer on basal half, but shorter than anteroventrals; 0 anterior and 3 posterodorsal to posterior preapical setae. Mid tibia without anterior setae; 10–12 posterodorsals, including 2 short ones at base, 4 posteroventrals and 3–4 posterior setae. Hind femur without posteroventrals but with some fine setae on basal half of posterior surface; with 7 strong anteroventral setae on apical half. Hind tibia with a row of 8 posterodorsals that become shorter on apical half; with a row of anterodorsals; 5–7 anteroventrals; 2–3 uneven rows of posterior and posteroventrals on middle; with a small ventral apical prong, without a dorsal and with an anterodorsal preapical; with 1–2 anteroventral but 0 posteroventral apical seta. 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 behind the point where subcosta enters costa. Cross-vein dm-cu oblique, sinuous. Calypters and margins yellow. Knob of haltere black.

Abdomen: Ground-colour black. Densely yellow-grey dusted. When viewed from behind with black markings as follows: syntergite 1+2 with an inverted triangular undusted mark, tergites 3–5 each with an undusted median line that broadens out towards hind-margins. Tergite 5 compressed and raised, at apex with a “basket” of dense, fine, long, curled, caudally-directed setae and setulae. Sternite 1 bare. Sternite 5 swollen ( Fig. 4 D). Terminalia : Figs 4 E–G.

FEMALE: Not known.

Remark. Adults of this species are found on flowering plants. Distribution. Russia: Altai Mts.

Figures

FIGURE 4. Drymeia cilitarsis (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.