We made a survey of biting midges in Aomori Prefecture,mainly in the Mutsu area between 1986 and 1987, resulting in the confirmation of 16 classified and four unclassified types.In the Mutsu area, as many as 14-20 species were identified.In terms of distribution of biting midges in Aomori Prefecture,old-northern species in common with those in Europe and in Siberia were observed in large number.However,the species and the number of midges varied depending on the site of collection.To roughly classify the predominant species of biting midges by area, C.sinanoensis, C.sanguisuga,and C.maculatus were predominant in Tsugaru and Sanpachi areas(Aomori, Hirosaki,Kizukuri and Hachinohe),while C.punctatus and C.erairai were predominant in Shimokita area (Mutsu).In Kamitosan area,the distribution seemed to be in-between that of both divisions.