Abstract
1) The observation on the seasonal prevalence of mosquitoes has been made at a cow barn in Kamo City, Niigata Prefecture, from March 1956 to May 1957 with the exception of winter season. 2) This collection has been made two or three times in each 10 days during the period using an insect net, and the total number of mosquitoes obtained was 3, 366, consisting of 52.5% Aedes vexans nipponii, 26.6% Anopheles sinensis, 11.6% An. sineroides, 6.8% Culex tritaeniorhynchus, 2.2% C. pipiens pallens, 0.3% Armigeres subalbatus, and 0.0% Aedes albopictus (Table 1). 3) Each of these species had their own seasonal prevalence as shown in Fig. 1 and 2. An. sinensis and An. sineroides appeared early in April and could not collect at the end of November. An. sinensis exhibited two definite peaks in occurrence, on the contrary An. sineroides showed nearly three peaks. Ae. vexans nipponii appeared in the middle of May, and disappeared in the middle of October, exhibiting two distinct peaks, the highest one was formed early in June. C. tritaeniorhynchus and C. pipiens pallens appeared early in July and disappeared late in September. 4) C. tritaeniorhynchus showed a small peak in occurrence early in August, on the contrary C. pipiens pallens did not show any peak.
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