Abiskomyia virgo subsp. orientalis Makarchenko et Makarchenko, subsp. nov.

Abiskomyia virgo orientalis Makarchenko et Makarchenko, subsp. nov.

(Figs. 76–79)

Material. Holotype: adult male, Russian Far East, the Chukotka Autonomous Okrug, Anadyrskyi District, Gytgylveirgytgyn Lake (upper stream of Velikaya River basin), 23.VII. 1980, leg. E. Makarchenko. Paratypes: 1 adult male, same data as holotype except 22.VII. 1980; 1 mature pupa (male), same data as holotype; 1 adult male, same data as holotype except 28.VII. 1980.

Adult male (n=3)

Total length 3.6–4.3 mm. Wing length 2.60–2.68 mm. Total length/wing length 1.53–1.65. Colouration brown to dark brown, wing grey.

Head. Temporal setae 10–13, including outer verticals and postorbitals, inner verticals absent. Clypeus massive, with 13–17 setae. Antenna 960–1056 µm long, with 13 flagellomeres and well developed plume; apex of flagellomere 13 obtuse (Fig. 76); AR 1.0–1.09. Palp with 5 palpomeres, length (in µm): 36–40, 48, 96–120, 44–76, 92.

Thorax. Dark brown. Antepronotum with 6–9 lateral setae. Acrostichals 2–9, placed only in lightly coloured oval area; dorsocentrals 19–35 (in 1–3 rows); prealars 5–14; scutellars 23–36 setae (Fig. 77).

Wing. R with 12–15 setae, R1 with 2–5 setae, R4+5 with 1–2 setae subapically. Apex of R4+5 distal of apex M3+4. Costa extension absent. Anal lobe well developed and rounded (Fig. 78). Squama with 26–28 setae.

Legs. Spur of fore tibia 64–68 µm (single male with 2 spurs of fore tibia 72 µm and 44 µm long). Spurs of mid tibia 52–60 µm long, of hind tibia 76–84 µm and 64–68 µm long. Hind tibial comb absent. Length and proportions of leg segments as in Table 5.

continued.

Hypopygium (Fig. 79). Tergite IX with 36–43 setae; anal point 44 µm long, narrow, subparallel-sided, sometimes slightly widened apically and bare. Laterosternite IX with 1–5 setae on each side. Transverse sternapodeme usually without oral projections, sometimes with very small projections. Gonocoxite 260–280 µm long; inferior volsella as in Fig. 79. Gonostylus 132–140 µm long, widest (52–56 µm) in basal part, narrowing towards tip, apical part slightly curved inwards, covered with long setae in outer part, megaseta absent.

Pupa (n=1). Total length 4.2mm. Main features are the same or similar to A. virgo virgo from Finland. Differences between both subspecies are shown in keys given above.

Larva unknown.

Ecology. Pupa was collected in mountain oligotrophic lake.

Diagnosis. See the keys.

Remarks. When comparing adults from Finland and Chukotka we paid attention to some differences in characters of the males, which may be the result of geographic variation between population of the same species or possibly Western European and Chukchi populations belong to different species. Therefore, we found it expedient to distinguish specimens from Chukotka in separating subspecies, future results of DNA analysis of both populations will aid in coming to a decision.