抄録
The fauna and distribution of the blackflies in Hiroshima Prefecture were studied based on the collections of larvae and pupae from streams and of adults flying around the collectors at 84 sites in spring of 1993. A total of 8,892 blackflies, 7,313 larvae (82.2% in total number), 1,574 pupae (17.7%) and 5 adults (0.1%), were collected at 83 sites. All these blackflies were classified into twenty species of the two genera Prosimulium and Simulium. Twelve species, Prosimulium (Prosimulium) kanii, P. (P.) kiotoense, P. (P.) yezoense, Simulium (Nevermannia) konoi, S. (N.) mie, S. (N.) subcostatum, S. (Gomphostilbia) ogatai, S. (Gom.) shogakii, S. (Gnus) daisense, S. (Gn.) nacojapi, S. (Simulium) quinquestriatum and S. (S.) rufibasis were newly recorded from Hiroshima Prefecture. The most abundant species was S. (N.) uchidai (40.2% in total number), followed by S. (N.) konoi (13.5%), S. (Gn.) bidentatum (11.9%), S. (S.) japonicum (10.2%) and S. (S.) arakawae (9.9%). The most widely distributed species was S. (N.) uchidai (70 sites), followed by S. (Gn.) bidentatum (33 sites), S. (S.) arakawae (32 sites), S. (S.) japonicum (29 sites), S. (N.) subcostatum (28 sites) and S. (O.) aokii (26 sites).
