Abstract
During a period from Oct. 1971 to Sept. 1973,a monthly survey of blackfly larvae and pupae was made at 8 stations on the Kobotokegawa river systems in the suburbs of Tokyo. 1. The number of individuals collected in this survey totalled 11,216,containing 11 spp., among which Simulium japonicum, S. bidentatum and S. suzukii were most numerous, whereas, S. subcostatum, S. uchidai, S. rufibasis, S. kawamurae, S. shogakii, S. arakawae, S. aokii and Prosimulim kiotoense were few in number. 2. Larvae of S. japonicum and S. suzukii were collected throughout the four seasons. 3. Many larvae of S. japonicum, 76%, were infected with nematodes, but the larvae parasitized were restricted during the period between February and April. 4. The infected larvae possessed from one to six nematodes. Among the 216 infected larvae 165 larvae contained 1 Nematode, 39 larvae 2,6 larvae 3,2 larvae 4,3 larvae 5,and 1 larva 6.
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