[The seasonal course in the population count of Anopheles in northern Tajikistan]

An. claviger is the only numerous species of malaria mosquitos in the mountain village of Bulgary in the Ura-Tyube District and this species occurs only in spring and autumn. An. hyrcanus and An. martinius predominated on the plane in a rice-growing region in the Syr Darya bottom land; the populations of these mosquitos were numerous starting from the end of July till the end of September, the peak being recorded in August. Among mosquitos attacking man An. hyrcanus predominated and only two An. pulcherrimus females occurred. In a mountainous river region with rice fields (Isfara District), "lights" An. martinius and An. superpictus forms predominated, whereas in spring and autumn An. martinius "dark" form prevailed. The population density of all mosquitos increased in August-September with the peak in the second half of August.