On the northernmost distribution of leaf beetles of the genus Oreomela (Coleoptera, Chrysomelidae): New species from mountains of southern Siberia

Three new species of leaf beetles are described: Oreomela dudkorum sp. n. (Terektinskii Ridge, Central Altai Mountains), O. tuvensis sp. n. (mountains of southeastern Republic of Tuva), and O. romantsovi sp. n. (Western Sayan Mountains). The representatives of this genus, and especially of the nominotypical subgenus, were found in Russia and in the territories mentioned for the first time. Thus, the distribution boundary of this genus is shifted 3–4° northwards. The representatives of Oreomela have most probably migrated from Tien Shan to the mountains of southern Siberia via the Mongolian Altai Mountains.