A Review of the Hoverflies (Diptera : Syrphidae) of Sakhalin and the Kuril Islands, with Descriptions of Two New Species

The hoverflies of Sakhalin and the islands of the Kuril Archipelago are reviewed. In total, 261 species are recognized ; 19 other species are listed as doubtful taxa. Two new species are described, one genus and 15 species are placed into synonymy, and 31 are recorded for the first time on Sakhalin and/or the Kuril Islands. Redescriptions or new diagnoses are given for two species, and there are two new combination. References to previous works, geographic distribution, and a list of material examined (including numbers of specimens, localities of capture, and approximate times of the year when the flies are in flight) are given for each species.