Number: 391, Pages: 1 - 23
The list of 52 species of geometrid moths (Lepidoptera: Geometridae) of the Baikal region (Irkutskaya oblast and Buryatia, Russia) is given. Rheumaptera neocervinalis Inoue, 1982 is reported as new for Siberia, 3 species are new for Baikal region, 18 species are new for Irkutskaya oblast and 4 species are new for Buryatia; distribution in the Baikal region of 4 species is confirmed; literature reference of 23 species from the region are considered as dubious. As result, total number of geometrids in the Baikal region reaches to 347 species from 153 genera. Genus name Scardostrenia Sterneck, 1928, stat. n., is removed from synonymy with the name Proteostrenia Warren, 1895; original combination of the name Scardostrenia reticulata Sterneck, 1928, comb. resurr. is restored. A key to Ourapteryx ussurica Inoue, 1993 and Ourapteryx sambucaria (Linnaeus, 1758) is given. Accuracy of the original geographic labels of the holotypes of Proteostrenia reticulata transbaicalensis Wehrli, 1939, Erannis bajaria var. transbaikalica Wehrli, 1928, and Nothomiza submediostrigata Wehrli, 1939, had been described from Buryatia and Zabaikalsky krai, is discus.
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