Abstract
A study of mosquitoes was made in each season of 1972-1974,in Chushin District, Nagano Prefecture, Japan. Eleven species were caught in light-traps around human dwellings, includings a pig pen. Anopheles sinensis group predominated among the blood-sucking mosquitoes, and were followed by Culex pipiens pallens and Aedes vexans. The population density of Culex tritaeniorhynchus was assessed to be very low (Table 1). The peak activity occurred in August in A. sinensis group, and slightly earlier in C. p. pallens. The density of C. tritaeniorhynchus decreased after the middle of July in the pig pen. Nine species of mosquito larvae were collected from rice fields by a dipping method. Larvae of A. sinensis group and Culex orientalis predominated, while those of blood-sucking Culex were sparse (Table 2). The intermittent irrigation management, which is widely adopted for the rice fields in this district, evidently depopulates mosquito larvae and influences the species composition of larvae.
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