[Data on the spread of Culex pipiens on the territory of the USSR].

A map of Culex pipiens molestus distribution over the USSR was made using data of sanitary epidemiological stations of various regions of the country, literature and the authors' own data. It was shown that during the last decades (1978-1990) the Cx. p. molestus breeding occurring predominantly in flooded basements of comfortable houses, especially in new built towns and cities, was recorded throughout the European part of the USSR including some subarctic regions. Cx. p. molestus is also widespread in the Asiatic part of the country including Western and Eastern Siberia, southern regions of Far East and the Sakhalin Island and Kamchatka. In the permafrost areas, most of new houses are built on piles without basements and cellars, and it prevents Cx. p. molestus breeding. The dates of appearance of these mosquitos in various parts of the country due to the development of transportation are discussed.