[Culicoides (Avaritia) sanguisuga, a new species of biting midges for the fauna of the USSR].

The occurrence in the USSR of C. (A.) sanguisuga Coq., a species recorded earlier only from North America has been stated. The species seems to have a wide distribution throughout the USSR. The description and figures of females and males collected in the south of Krasnojorsk territory are given. In the author's opinion the male of C. sanguisuga was repeatedly described in the Soviet literature but under other names (C. obsoletus, C. seimi). Morphological characters of females of four species of the subgenus Avaritia (C. sanguisuga, C. sinanoensis, C. chiopterus and C. filicinus) recorded from the region of observations are described.