Abstract
The specimens of two species of adult mosquitoes, Mansonia (Mansonioides) uniformis and Mansonia (Coquillettidea) ochracea were collected by the dry-ice collection method and the light-trap collection method at the Midoroga-ike pond which is situated in the northern part of Kyoto City from February to November in 1964. Seasonal flight activities of Mansonia (Mn.) uniformis were seen at this pond from the end of May to the beginning of October. Seasonal variation of wing-length of adult females of Mansonia uniformis were observed that the wing-length is longer in spring and autumn than in summer as well as in the case of Culex tritaeniorhynchus.
Namely it seems to be that Mansonia mosquitoes are hibernated in adult stage in their life cycle. Mansonia uniformis is attractived to CO2 strongly, while Mansonia ochracea is aggregated to the light-trap collection method. Therefore, it is clarified that there are two different type of taxis i.e. chemotaxis for Mansonia uniformis and phototaxis for Mansonia ochracea.
