Drymeia sibirica Hennig 1962

Drymeia sibirica (Hennig, 1962)

Fig. 18 D

Bebryx sibirica Hennig, 1962a: 671.

Drymeia sibirica; Pont, 1986: 72.

Drymeia sibirica; Sorokina & Pont, 2010: 11.

Material examined. Holotype, male, RUSSIA: Sakha Republic [Yakutskaya Oblast]: Verkhoyansk, 1–2.vi.– vii.1903, Rozhnovskiy (ZIN). Tyva Republic, Morgun-Taiginskii kozhuun: 1 male, environs of Mugur-Aksy, 2000– 2100 m, ~ 50º22'N 90º25'E, 22.vii.1993, A. Barkalov. Altai Republic, Kosh-Agachskii raion: 2 females, valley of River Akbul, 49º39'N 88°1'E, 12.vii.2009, T. Novgorodova.

Description. Hennig (1962a: 671) gave a detailed description of the male, with illustrations of several leg characters, but he did not know the female. We give here a description of the female, based on our new material. FEMALE. Length of body, 7.2–8.5 mm. Length of wing, 6.2–7.0 mm.

Head: Dichoptic. Frons at middle 0.42 of head-width at this point, and at this point each fronto-orbital plate 0.24 of frontal vitta. Head whitish-grey dusted. Frontal triangle inconspicuous, not reaching the crossed setae on frontal vitta. Frontal vitta grey or yellowish dusted. Eye with short fine hairs. Ocellar setae strong. 7–8 pairs of inclinate frontal setae, including several interstitials; 3 pairs of orbital setae, the upper two pairs reclinate and exclinate, the lower pair proclinate and exclinate. Frontal vitta with a pair of strong crossed setae. Antenna black, postpedicel circa 1.5 times as long as wide. In lateral view, facial edge not projecting forward beyond the level of profrons. Arista swollen in basal sixth, appearing almost bare, the longest hairs shorter than basal diameter of arista. Parafacial at level of insertion of arista 1.7 times as wide as width of postpedicel. 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 thickened, short. Labella large. Prementum of proboscis dusted, as long as palpus.

Thorax: Ground-colour black. Scutum whitish-grey or brownish-grey dusted, sometimes with three indistinct brown vittae running along dorsocentrals and between them. Pleura and scutellum dusted as the scutum. Groundsetulae very short. Dorsocentrals 2(3)+4. Prealar present, but weaker and half as long as 2nd notopleural seta. Acrostichals 0+2. Katepisternal setae 1+1, sometimes with 2–3 stronger setulae below posterior seta. Anepimeron setulose. Katepimeron bare. Scutellum black and dusted in posterior view.

Legs: Black, but all legs with tarsomeres 1–2 brownish-yellow, all tarsomeres brownish laterally. Fore tarsomeres 1–4 each with a short fine anteroventral and posteroventral hair at tip. Fore tibia with 2–3 posteroventral setae on apical half. Mid femur with 2 strong anteroventral setae and 3–4 posteroventral setae on basal quarter and with a few fine setae on the posterior to posteroventral surface at base. Mid tibia with 3 anterodorsals, without anteroventrals, 7 posterodorsals, 3–6 posteroventrals (2 long and 4 very short). Hind femur without posteroventrals; with 6 strong anteroventral setae on apical half and a row of shorter setae on basal half. Hind tibia with 5–6 posterodorsals, with a row of 6 anterodorsals, and 4–6 anteroventrals on middle part; dorsal preapical seta strong, and anterodorsal preapical 2/3 of its length; 1 anteroventral but 0 posteroventral apical setae.

Wing: Yellow or brownish tinged, especially at base. Basicosta and tegula black. Costa with weak spinules, without costal spine. Cross-vein dm-cu oblique, sinuous. Calypters and margins yellow. Knob of haltere black.

Abdomen: Grey dusted, with an indistinct dark vitta. Without strong setae.

Distribution. Known only from the Russian localities listed above.