A review of Tychobythinus theryi species group with description of a new species from Algeria (Coleoptera, Staphylinidae, Pselaphinae)

Seven species of Tychobythinus Ganglbauer, 1896 from north-eastern Algeria are very similar in externalmorphology and shape of aedeagus. Tychobythinus theryi (Guillebeau, 1894) Tychobythinus bordei (Peyerimhoff,1919), Tychobythinus longipalpis (Normand, 1930), Tychobythinus normandi (Jeannel, 1956) and Tychobythinuspeyerimhoffi (Jeannel, 1956), grouped by Jeannel (1956: 60) in the genus Anopsibythus (type species: Machaeritestheryi Guillebeau, 1894), now are transferred to Tychobythinus (Besuchet 1962: 349; Besuchet 1974: 333; Newton& Chandler 1989: 48; Löbl & Besuchet 2004: 314). Tychobythinus araneipes (Normand, 1930) and Tychobythinusmonoceros (Normand, 1932) have recently been redescribed, illustrated and attributed to the genus Tychobythinus(Besuchet et al. 2013). For all these species we propose and define a new species group, Tychobythinus theryigroup, to include species formerly in the genus Anopsibythus, and Tychobythinus besucheti sp. n. New detailsconcerning the morphology of these species and an identification key are also provided.