Rhamphomyia (Pararhamphomyia) septentrionalis Sinclair, Vajda, Saigusa & Shamshev

Rhamphomyia (Pararhamphomyia) septentrionalis Sinclair, Vajda, Saigusa & Shamshev

(Figs 39, 40)

Rhamphomyia (Pararhamphomyia) septentrionalis Sinclair et al., 2019: 65. Type locality: Victoria Is. (71°17′N, 114°W), Northwest Territories, Canada.

Other references: Shamshev, 2016: 70 (checklist, partly as Rhamphomyia (Pararhamphomyia) tenuiterfilata Becker, 1900).

Material examined. RUSSIA. Chukotka AO (Wrangel Island): middle flow of Mamontovaya River, N Perkatkun, osier-bed in river valley, 17, 21.vii.1972, KBG (17 ♂, 13 ♀, ZIN); same locality, 71°10′N 179°45′W, BT 14, 9.vii.2006, OAK (4 ex., SZM); same locality and biotope, Sw, 2.vii.2015, OAK (2 ♂, 5 ♀, ZIN); same locality, BT 3, 9.vii.2006, OAK (1 ex., SZM); same locality and biotope, Sw, 1.vii.2015, OAK (1 ♂, ZIN); same locality, BT 20 A, Sw, 2.vii.2015, OAK (2 ♂, ZIN); spurs of Pervaya Mtn, 71°09′N, 179°27′W, BT 11, Sw, 28.vi.2015, OAK (6 ♂, ZIN); upper flow of Neizvestnaya River, 71°13′N, 179°19′W, BT 4 A, 5.vii.2006, OAK (1 ex., SZM); same locality and biotope, Sw, 22.vi.2015, OAK (3 ♂, ZIN); same locality and biotope, 26.vi.2015, OAK (1 ♂, ZIN).

Recognition. Mid-sized (wing length 5.4–6.1) blackish slender flies. Male (Fig. 39) holoptic; scutum faintly greyish pruinescent, with 4 narrow shiny vittae; presutural dc pale 1–2-serial, hair-like, moderately long, acr biserial, similar to but somewhat shorter than dc, laterotergite with pale setae; legs long, very slender, shiny, with strongly reduced setation; hind tibia gently curved inwards beyond middle, hind basitarsus long spindle-shaped, with dense long hair-like setae dorsally; wing faintly infuscate, CuA+CuP almost complete, well sclerotized, disappearing or evanescent just before wing margin, halter yellow; abdomen with shiny dorsum, covered with pale setae; terminalia longer than thorax; epandrium elongate, almost strap-like, somewhat broadly constricted on about middle, with broadly rounded apex; cercus long, but shorter than epandrium, narrow, constricted on about middle; phallus very long, hair-like, without loops, extended beyond epandrium. Female (Fig. 40) wing broad, brownish; hind tibia and tarsus simple; legs without pennate setae.

Distribution. Holarctic; R. septentrionalis occurs in the low arctic west of Hudson Bay of North America and in northern regions of Russia (Sinclair et al. 2019).

Habitat. On Wrangel Island this species was collected in the central part of the island, where it was found mainly in river valleys with willow bushes.