Abstract
Studies on the medically important insects, especially on mosquitoes and flies were carried out since July, 1955. Specimens collected by Light trap, aspirator and dipper f rom field in and around Juntendo University were identified. Results obtained by this survey are listed on Table 1 and Table 2. 3 genera, 6 species, 223 individuals of mosquitoes were collected by light trap and over 1500 mosquitoes were examined in winter, but Culex tritaeniorhynchus, the most important vector of Japanese B encephalitis was not able to be collected since the begining of October.
4 genera, 5 species, 460 of flies were collected by Light trap and same species of flies were identified by field surveys.
Relation of seasonal occurrence of mosquitoes to environmental factors has been studied, but no conclusion came yet.
