抄録
Overwintered females of Culex tritaeniorhynchus, which is the most important vector of the Japanese encephalitis (JE) virus, were collected by using dry ice-traps from March to June at Izumi-Mibayasi area in Osaka Prefecture, 1967-1975. Ovarian dissections revealed that almost all of the females just having emerged from hibernation were nulliparous. From the beginning of September to the first week of October the numbers of host-seeking females of tritaeniorhynchus collected with the CO_2 baited light trap continued to decrease to zero. However, autumnal build-up of its larval population was observed. These results indicated that in the fall few newly-emerged females were developing an appetite for blood. From these results above mentioned, it is not likely that JE virus overwinters in the bodies of tritaeniorhynchus females.
