New Data on the Fauna of Leaf Beetles (Coleoptera, Chrysomelidae) from the South of the Russian Far East

Four species are recorded from Russia for the first time: Altica cirsicola Ohno, 1960, Neocrepidodera recticollis (Jacoby, 1885), Sphaeroderma tarsatum Baly, 1874, and Cassida koreana Borowiec & Cho, 2011. A new color form of Cryptocephalus flavoscutellaris Medvedev, 1973 is described from Sakhalin. The variability of body coloration in Cryptocephalus nigrofasciatus Jacoby, 1885 is discussed. The following synonymy is confirmed: Cryptocephalus nigrofasciatus Jacoby, 1885 = Cryptocephalus turpis Chen, 1942. Two taxa, Cryptocephalus sagamensis Tomov, 1982 from South Korea and C. nigrofasciatus , are probably conspecific. A new record of Altica caerulescens (Baly, 1874) from Russia is provided and its differences from Altica viridicyanea (Baly, 1874) are given. New data on the rare species Aphthona ussuriensis Romantsov, 2021 and Monolepta pallidula (Baly, 1874) are presented. The status of three similar species of the genus Sphaeroderma Stephens, 1831 ( S . fuscicorne Baly, 1864, S. akebiae Ohno, 1964, and S. unicolor Kimoto, 1965) is discussed, and a new identification key to all the species of this genus from the Russian Far East is compiled. Characters for differentiating Cassida koreana Borowiec et Cho, 2011 and Cassida vespertina Boheman, 1862 are given. Photos of the adult habitus and genitalia are provided for all the above species and their close allies.