Hydrotaea unispinosa Stein, 1898

Material examined. RUSSIA: Altai Republic: 1♂, Seminskiy Pass, Turala River valley, 50.99°N 85.68°E, 1350 m asl, 8– 13.07.2016, leg. N. Vikhrev (ZMUM).

Other records: RUSSIA: 1♂, Moscow reg., Ruza env., 55.66°N 36.05°E, 1– 10.06.2016, leg. E. Erofeeva (ZMUM) ; 1♂ 1♀, Primorsky reg., Kedrovaya Pad National Reserve (Primorsky env., 43.1°N 131.5°E), 17– 19.08.1962, leg. E. Nartchuk (ZIN) .

Remarks. The taxonomy and distribution of Hydrotaea unispinosa Stein, 1898 was dicussed in Vikhrev & Gomyranov (2014). It is an uncommon but remarkably widespread species. This species is known from: Nearctic, Canada and USA from East to West between 40°N and 50°N; Oriental, foothills in the northern part of the ecozone, India: Uttarakhand and West Bengal regions, Nepal, Thailand, Chiang Mai region; Vietnam, Lai Chau region; Palaearctic: Europe (Sweden); Asia (China, Liaoning region). The record from the Altai Republic and the two further localities given above are the first findings of this species in Russia.

Distribution. Holarctic and Oriental.