Based on the large examined materials of Tersilochinae from the Zoological Institute of the Russian Academy of Sciences (St Petersburg) and other world collections, faunistic records from the Palaearctic Region (mainly from Russia) for 87 tersilochine species belonging to ten genera are provided, including ten species recorded for the first time from Russia. Two new species, Probles smaragdites Khalaim, sp. nov. and Tersilochus turpiculus Khalaim, sp. nov., are described from the Russian Far East. Gelanes tootsae Khalaim, 2002 syn. nov. is synonymised with G. cuspidatus Khalaim, 2002. Tersilochus kerzhneri Khalaim, 2007 is excluded from the fauna of Europe. The male of Tersilochus impunctator Khalaim, 2012 is recorded for the first time. Specimens of Tersilochinae, deposited in the Zoological Institute RAS (St Petersburg) and the Zoological Museum of the Moscow State University (Moscow) and briefly mentioned from the former USSR by K. Horstmann in his revisions (1971, 1981), are found, re-examined, and their complete label data are provided.

Fauna of the ichneumonid subfamily Tersilochinae of Belarus is reviewed. Eleven genera comprising 55 species have been recognized: Allophroides Horstmann (2 species), Aneuclis Förster (5), Barycnemis Förster (10), Diaparsis Förster (6), Epistathmus Förster (1), Gelanes Horstmann (3), Heterocola Förster (1), Phradis Förster (5), Probles Förster (8), Spinolochus Horstmann (2) and Tersilochus Holmgren (12). One species, Probles dronkia Khalaim sp. nov., is described as new to science, and 42 species are recorded from Belarus for the first time increasing Belarus fauna of Tersilochinae almost 4.6 times.

Palaearctic material of the genus Heterocola Förster was studied, the holotypes of four species were examined and re-described. Heterocola concava (Uchida) from Japan is transferred to Phradis Förster (comb. nov.), and the genus Heterocola is excluded from the fauna of Japan. Specimens of H. proboscidalis (Thomson) and H. rufiventris Horstmann deposited in the Zoological Institute RAS (St Petersburg) and briefly mentioned from the former USSR by K. Horstmann in his revision (1981) are found and re-examined, and their complete label data are provided. Extensive faunistic records of the Palaearctic species of Heterocola primarily based on the Zoological Institute RAS collection are provided. Colour photographs of six species are given for the first time. An identification key to six species of Heterocola occurring in the Palaearctic region is provided; taxonomic status of the seventh species, H. pappi Kolarov, is not clear.

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