A REVISION OF THE APTERUS-GROUP OF THE GENUS TACHINUS GRAVENHORST (COLEOPTERA: STAPHYLINIDAE)

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Abstract
Four species have been described in the apterus-group of the staphylinid genus Tachinus Gravenhorst. One of these, tundrae Poppius, is regarded as a synonym of brevipennis Sahlberg. Tachinus arcticus (Motschulsky) is recognized as a valid species, although earlier works have considered it a synonym of apterus. Tachinus brevipennis is recorded from the Nearctic Region for the first time. A neotype is designated for arcticus and lectotypes are designated for brevipennis and tundrae. Tachinus instabilis Mäklin is transferred to the apterus-group from the fimbriatus-group and recorded for the first time from Siberia. One new species, T. glacialis, is described from Siberia.A key for identification of the species of the group and a description of the group characters are included. Each of the five species is described and the major diagnostic characters illustrated with scanning electron photomicrographs. A map is included to show the distribution of the species.

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