Hover flies of the genus <i>Dasysyrphus </i>Enderlein, 1937 (Diptera, Syrphidae) from the Urals, Siberia and the Far East
Species of the genus Dasysyrphus inhabiting the Urals and the Asian part of Russia have been investigated: 17 taxa have been determined, of which two, Dasysyrphus shiloi Barkalov, sp.n. and D. pauxillus difficilis Barkalov, ssp.n., are newly described Holotypes of the new taxa are kept in the Siberian Zoological Museum of the Institute of Animal Systematics and Ecology of the Siberian Branch of RAS (Novosibirsk). The female of D. lapidosus Barkalov is described for the firs time. The taxonomic status of D. kegali Viol. is restored and the name D. lenensis Bagat. is synonymized with D. nigricornis (Verrall). A key to all species is provided. The species list contains synonyms, references, descriptions of rare species, and remarks on taxonomy and ecology; maps of collecting places for common taxa are also included. For all species, illustrations of male and female heads, male genitalia and other morphological structure necessary for their identification are provided.