南泥湾四周环山,中间为一狭长盆地,汾川河横贯其间,作物以水稻为主。地面积水多,为蚊虫滋生提供了条件。蚊种调查表明,该地区有4属17种,其中以凶小库蚊占绝对优势,对人骚扰最大。为探讨凶小库蚊的活动,我们于1981～1982年在蚊的活动旺盛季节,进行了该蚊昼夜活动的观察。 Nanniwan surrounded by mountains, the middle of a narrow basin, Fenchuan River runs through it, the main crops of rice. The area of ​​juicy, provided breeding grounds for mosquito breeding. Investigation of mosquito species shows that there are 4 genera and 17 species in the area, among which Culex pipiens pallens occupy the absolute predominance and harass people most. In order to explore the activities of Culex pipiens pallens, we observed the circadian activity of the mosquitoes during 1981 ~ 1982 in the vigorous season of mosquitoes.