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The abundance level of blood-sucking Diptera is, to a large extent, determined by natural and climatic conditions and hydrological regime of rivers, and is subject to significant fluctuations. In order to assess the impact of meteorological conditions of the season on the abundance of blood-sucking Diptera, the abundance ratio of horseflies, mosquitoes, blackflies and midges in the forest-steppe zone of Tyumen Region for 2006, 2013-2017 was compared. The study was performed in the surroundings of Isetskoye Village and Barkhatovo Village in Isetsky District of Tyumen Region. This area belongs to the province of Tobol forest-steppe. The study area is located on the left bank of Iset river. The forest-steppe zone is located in the south of the region. The region has very cold winters, the average temperature in January is -18-20º?. The summer season lasts about 125 days, the average temperature in July is +19-20ºC. Spring and autumn seasons are short. The region is characterized by late frosts in spring until the end of the first decade of June and early autumn, and sometimes in late August. Analysis of data obtained showed that of the six seasons studied the largest gnus abundance was registered in 2014, the minimum abundance was in 2006. The abundance level and the individual components ratio of «GNUS» complex were subject to significant changes depending on the season, in 2006 and 2014, the blackflies were mostly collected, and in 2013, 2015-2017 –mosquitoes. Meteorological and hydrological conditions of winter and spring seasons have the greatest impact on the level of insect populations of «gnuts» complex. Seasonal fluctuations in abundance of blackflies was 3 times, midges ???9, horseflies and mosquitoes ???10. The main limiting factors for the mass development of blood-sucking Diptera in the forest-steppe zone of Tyumen Region are hard and dry winters that cause insect death at the pre-imaginal stages of development, as well as huge temperature swings in spring and summer and small areas of breeding grounds. Key words: Horseflies; Mosquitoes; Blackflies; Midges; Abundance; Meteorological conditions; Tyumen region References Agroclimatic resources of Tyumen Region (Southern part). (1972). Under the editorship of Cherkashenin E.F. Leningrad: Gidrometeoizdat, 151. Chernyshev, V. B. (1996). Ecology of insects. Moscow: MSU, 304. Detinova, T. S., Rasnitsyn, S. P., Markovich, N. Ya., Kupriyanova, E. S., Aksenova, A. S., Anufrieva, V. N., Bandin, A. I., Vinogradskaya, O. N., Zharov, A. A. (1978). Unification of census methods of blood-sucking Diptera. Medical parasitology and parasitic diseases. 5, 84-92. Fiodorova, O. A., Khlyzova, T. A., Savchuk, T. E. (2018). 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Biological rationale for and terms of carrying out actions to protect cattle from gnats in the South of Tyumen region: Methodical recommendations. Tyumen. 48. Pavlova, R. P. (1968). On the abundance of horseflies in cattle grazing areas. Problems of veterinary hygiene/Proceedings of the Institute of Veterinary Sanitation (VNIIVS). Tyumen. 31, 18-22. Physical-geographical regionalization of Tyumen region (1973). Under the editorship of N.A. Gvozdetsky. Moscow: MSU. 246. Rasnitsyn, S. P., Kosovskikh, V. P. (1979). An improved method of accounting for the abundance of mosquitoes a net around the person and comparing it with the light of a dark bell. Medical parasitology and parasitic diseases. 1, 18-24. Rubtsov, I. A. (1956). Blackflies (family Simuliidae). Fauna of the USSR. Diptera. 6, 6. Moscow-Leningrad. 680 p. Western Siberia. (1963). Under the editorship of G.D. Richter. Moscow: USSR Academy of Sciences Publishing House. 488.

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