Faunistic sampling in the western Caucasus (Russian side) has yielded two new species belonging to the subgenus Neobisium (Neobisium) Chamberlin, 1930 which are described and illustrated here: Neobisium (N.) catherineaen. sp. and Neobisium (N.) kamenskyin. sp. The species Neobisium (N.) speleophilumKrumpál, 1986 is redescribed and illustrated based on the newly collected Russian material. In addition, some notes on the morphological and morphometric variations of Neobisium (N.) anatolicumBeier, 1949 andNeobisium (N.) labinskyiBeier, 1937 are given. In addition, an identification key to adults of the Neobisium (N.) species so far found in Russia is provided.
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Vol. 18 • No. 5