[The topographic selectivity of the landing and feeding by sucking of gadflies (Diptera: Tabanidae) in attacking cattle].

The detailed maps of the distribution of sittings and feedings of the 12 tabanid species among 22 zones of a cow's body are given. The material on the observations of individually marked tabanids attacking a single cow in conditions of the Pskov region in 1984-1990 (Konstantinov, 1992) has been used in present paper. It is established, that the distribution of sittings and feedings onto the cow's body has a species-specific character. The 12 species were arranged into 5 groups based on characters of the topographical similarity of their distributions. The distribution of feedings has the less range than the distribution of sittings within each species. The distribution of sittings and feedings within each species coincide average by 60%. The effectiveness of tabanid's sittings is different within different zones of the cow's body.