Abstract
As one of the extensions of our serial study on Japanese B encephalitis started in 1950, we collected mosquitoes from May through September, 1961 mostly at Kurashiki City and a single spot of Okayama City. This year the light trap was improved and a set of home-made saran-wire filter and nylon net was used instead of a cyanide tube in order to obtain alive mosquitoes in good shape. The collection was undertaken 32 times during nights twice a week except on rainy nights. The mosquitoes collected totaled 22, 682 (Kurashiki) and 8, 620 (Okayama) Culex pipiens were found early May being reached the peak population at around the 10th of July coinciding with the time of plentiful rainfall, and decreased gradually with the onset of the hot season. Culex tritaeniorhynchus appeared in the middle of June and the peak population lasted for about a month starting in the middle of July followed by a sudden decrease in number. Anopheles sinensis were not abundant being found from the middle of June through the middle of August, and the peak population was observed between the beginning of July and the middle of August. Eight cases (Kurashiki) and nine cases (Okayama) of Japanese B encephalitis were reported during this summer between the middle of August and the middle of September.
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