Abstract
Development of insecticide-resistance among Japanese mosquitoes was first reported by Suzuki et al. (1958, 1959) in regard to the adults of Culex pipiens porllens against chlorinated hydrocarbons.
Subsequently, during a period from 1959 to 1960, samples of mosquitoes were collected from various sources in Tokyo area by the present author, and their resistance level to insecticides was investigated.
The present paper deals with the results of the laboratory work carried out with the larvae and adults of several populations of Culex pipiens and with the larvae of certain populations Culex tritaeniorhynchus, Aedes albopictus and Armigeres subalbatus.
