Abstract
The new species Pseudentephria irinae Vasilenko, sp. n. is described. The records for three geometrid species, Xanthorhoe borealis Hulst, 1896, X. malaisei Djakonov, 1929, and Idaea rufaria (Hubner, [1799]), are given. The systematic position of X. malaisei is corrected. X. borealis in Russia and I. rufaria in Siberia were found for the first time. The distinctions in the coloration and pattern of the wings, as well as in the genital structures, between closely related species X. ferrugata, X. malaisei, and X. borealis are shown.
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