Revision of Palaearctic species of the genus Tachydromia Meig. ( = Tachista Loew) (Diptera, Empididae)

Abstract: The present paper is a revision of Palaearctic species of the genus Tachydromia Meigen, 1803 (= Sicodus Raf., 1815, Tachista Loew, 1864) based on study of the type material and many collections of European Museums and Institutions. At the present time there are known on the whole 45 species of this genus in the Palaearctic region. Some new synonymy is established: Tachysta styriaca var. semifasciata Strobl, 1893 is synonym of T. ornatipes (Becker, 1890); Tachysta connexa var c Strobl, 1893 is synonym of T. arrogans (Linnaeus, 1761); Tachista barbata Oldenberg, 1920 is synonym of T. styriaca (Strobl, 1893); Sicodus submorio Collin, 1961 is synonym of T. costalis (von Roser, 1840). A lectotype is designated for Tachydromia denticulata (Oldenberg, 1912), T. aliterpicta (Becker, 1889), T. ornatipes (Becker, 1890), T. styriaca (Strobl, 1893) and T. tuberculata (Loew, 1864). Two forms, Tachysta interrupta v. obsoleta Strobl, 1910 and Tachysta arrogans v. productipes Strobl, 1910, are raised to specific rank and five species are described here as new to science: Tachydromia parva, sp. n., T. pseudointerrupta, sp. n., T. elbrusensis, sp. n., T. anderssoni, sp. n. and T. caucasica, sp. n.

Key words: Tachydromia, Empididae, Diptera, Palaearctic, revision, new species, key to species, new combination, Europe, Slovakia, Canary Islands, Caucasus, Sweden, Norway, Finland, new synonymy, lectotype designation