Abstract
The fauna and distribution of the blackflies in Aomori Prefecture were studied based on the collections of larvae and pupae from streams and adults flying around the collectors at 98 localities in summer of 1991. A total of 12,257 blackflies, 10,956 larvae (89.4% in total number), 1,290 pupae (10.5%) and 11 adults (0.1%), were collected at 83 sites. All these blackflies were classified into sixteen species of the genus Simulium Latreille. Four species, Simulium (Nevermannia) mie, S. (Gomphostilbia) ogatai, S. (Gom.) shogakii and S. (Simulium) kawamurae, were newly recorded from Aomori Prefecture. The most abundant species was S. (N.) uchidai (27.1% in total number), followed by S. (S.) japonicum (22.4%), S. (S.) suzukii (16.4%) and S. (Odagmia) aokii (15.2%). The most widely distributed species was S. (N.) uchidai (59 sites), followed by S. (S.) japonicum (49 sites), S. (O.) aokii (48 sites), S. (S.) suzukii (38 sites) and S. sp H. (36 sites).
