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A new genus of leaf beetles, Aulacioides gen. n., and a new species, Aulacioides spiridonovi sp. n., are described. Aulacia laeta L. Medvedev, 2004 has been transferred to Aulacioides , comb. n., which is also the type species of the new genus. Four new species of Aulacia Baly are described: A. guskovae sp. n., A. limbipennis sp. n., A. longicostata sp. n., and A. moseykoi sp. n. Three new species of the genus Colaspoides Laporte are described from the Island of Java, Indonesia: C. filimonovi sp. n., C. fuscoaenoides sp. n., and C. pangrangensis sp. n. Three more species of Colaspoides have been transferred to Aulacia : A. bicoloricollis (Medvedev et Romantsov, 2014), A. cyaneipennis (Medvedev, 2004), and A. minuta (Medvedev, 2006), all comb. n. New identification keys have been compiled to almost all species of the genus Aulacia , both species of Aulacioides gen. n., and all known species of Colaspoides from Java. The following new species groups showing similar characters are proposed: the femorata group from Borneo for the species with a narrow frons and a carina on the pygidium; this group includes A. femorata Baly, 1867; A. fulviceps Baly, 1867; and A. longicostata sp. n.; the cyaneipennis group, again from Borneo, for the species with a wide frons and a wide lateral border of the elytra, the aedeagus being truncated at the apex and bearing a denticle in the middle, and the pygidium showing no carina. This group includes A. cyaneipennis , A. limbipennis sp., and A. moseykoi sp. n. The diversa group is proposed, and its taxonomic status is discussed to incorporate three poorly studied and similar species of Aulacia : A. diversa Baly, 1867; A. flavifrons Jacoby, 1896; and A. fulvicollis Jacoby, 1899, all from Malacca and Sumatra and all sharing an entirely or partially black body upper side and several carinae on the sides of the elytra in females. Aulacia brunnea Jacoby, 1894 is recorded from Sumatra for the first time. Photographs of the adult habitus in dorsal view and of the genitals are provided for almost all the above closely related species. A new name, Colaspoides alexei nom. n., is proposed to replace Colaspoides aeneoviridis Romantsov et Moseyko, 2023, a junior homonym of Colasposoma aeneoviride Clark, 1865; the latter species was subsequently synonymized with Colaspoides cuprea Baly, 1867.

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.

AbstractTwo new species of the leaf-beetles, Aphthona ussuriensissp. n. and Tricholochmaea ussuriensissp. n., are described from Primorskii Territory of Russia. Seven species are recorded from Russia for the first time: Lema concinnipennis Baly, 1865; Phratora ryanggangensis Gruev, 1994; Dibolia potanini Wiese, 1889; D. zaitzevi Medvedev, 1980; Longitarsus hopeianus Chen, 1941; L. piceorufus Chen, 1939; Luperomorpha nigra Chen, 1933. A new finding of Longitarsus nipponensis Csiki, 1940 in Russia is reported. A new color form of Cryptocephalus luridipennis Suffrian, 1854 is described from the Sikhote-Alin Mountains. New identification keys to all the species of the genera Aphthona and Luperomorpha and to the species of Monolepta with a yellow pattern on black elytra from the Russian Far East are compiled. Photographs of the dorsal habitus of the adults and of the aedeagus are provided for all the aforementioned species and also for those included in the keys and plus Aphthona hammarstroemi Jacobson, 1901, Tricholochmaea semifulva Jacoby, 1885, and Pyrrhalta flavescens (Weise, 1887) closely related to the new species described herein. Photographs of the spermatheca of Monolepta hieroglyphica biarcuata Weise, 1889 and M. quadriguttata (Motschulsky, 1860) and of the male pygidium of M. quadriguttata (Motschulsky, 1860) with a deep transverse depression are also given for the first time; the latter character is newly reported to distinguish M. quadriguttata from all the Far Eastern congeners.

An emended description of the genus Aulacolepis is given, and the taxonomic status, diagnostic characters, and geographical distribution of its representatives are clarified. Two species groups which differ in the degree of dilation of the lateral margins of the elytra and in the density of the scales covering the dorsal side of the body are distinguished. The representatives of the mouhoti species-group distributed in mainland Indochina, the Malay Peninsula, and some adjacent islands have sparse scales on the dorsal side of the body and narrow lateral margins of the elytra. The species of the decorata group from Singapore and the Greater Sunda Islands have denser scales on the dorsal side of the body and widely flattened lateral margins of the elytra. Two new species of this genus have been described: Aulacolepis malayana sp. n. inhabiting the Malay Peninsula and adjacent islands (including Phuket) and belonging to the mouhoti species group, and the Bornean Aulacolepis borneensis sp. n. from the decorata species group. Aulacolepis decorata Baly, 1867 is recorded for Singapore and Java for the first time. An identification key is compiled for all the species of the genus, and photographs of the beetles and their genitalia are provided for the first time.

Oulema duftschmidi (Redtenbacher, 1874), Phyllotreta astrachanica Lopatin, 1977, and Ph. procera (Redtenbacher, 1849) are recorded for the first time for Uzbekistan; Longitarsus stragulatus dichrous Khnzorian, 1962 is recorded for the first time for Tajikistan. The geographic distribution of Acolastus pallidus (Lopatin, 1956) and Aphilenia ornata Reitter, 1889 is clarified. For all the taxa considered, images of the adult habitus and male genitalia (for some of them) are given.

Thirteen species of leaf beetles of the genus Colaspoides Laporte are described as new to science: Colaspoides cameronensis sp. n., C. asarovi sp. n., C. nikandrovitshi sp. n., C. pahangensis sp. n. from the Malay Peninsula, and Colaspoides aeneoviridis sp. n., C. borneomontana sp. n., C. bruneiensis sp. n., C. metallactus sp. n., C. costipennis sp. n., C. gunungensis sp. n., C. latipalpis sp. n., C. paraviolacea sp. n., and C. vityukovae sp. n. from the island of Borneo. New keys are proposed for the species complexes of C. cognata Baly, 1867 and C. cognatella L. Medvedev, 2004, C. borneomontana sp. n., and C. viridimarginata Baly, 1867.

AbstractA new species of the leaf beetle subfamily Cryptocephalinae, Cryptocephalus tauricussp. n., is described. Synonymy, variability, and distribution are analyzed, and a new key is given to 13 species of the subgenus Burlinius, which have entirely or partly yellow elytra and are distributed in the European part of Russia, in the Caucasus, and Transcaucasia. New diagnostic characters have been found for several species. Cryptocephalus macellus Suffrian, 1860 is recorded for the first time from Abkhazia and Armenia; C. macilentus Lopatin, 2001, from Armenia, and C. araxicola Iablokoff-Khnzorian, 1968, from Turkmenistan. A new synonymy is established: Cryptocephalus araxicola Iablokoff-Khnzorian, 1968 = C. xanthus Iablokoff-Khnzorian, 1968 syn. n.; = C. rastegari Rapilly, 1980, syn. n. A new pale color form of Cryptocephalus chrysopus (Gmelin, 1788) is described. For all the taxa considered, images of the adult habitus and male genitalia are given.

AbstractTwo new species of the subfamily Eumolpinae are described: Colaspoides patrikeevi sp. n. from China and Colaspedusa houaphanica sp. n. from Laos. The type series of Colaspoides pseudodiffinis L. Medvedev, 2004 is shown to include, in addition to this species, some specimens of C. paddis Aslam, 1968 and C. pallidicornis Tan et Zhou, 1997. The synonymy, variation, and distribution of species of this complex, and also of forms of the C. prasinus Lefèvre, 1890 complex (including the subspecies C. p.occidentalis L. Medvedev, 2004) are discussed. Colaspoides prasinus prasinus is recorded from China and Thailand for the first time. The habitus and genitalia are illustrated for most of the taxa considered.

A new leaf-beetle species, Acolastus paki sp. n., is described from Tajikistan. New data (including photographs of the aedeagus and habitus) on Acolastus afghanicus, A. anthracinus, A. karatavicus, A. lygaeus, A. nanus, A. nigrifrons, A. syrdariensis, and Tituboea elegantissima are reported.

A total of 245 species of 59 genera and 12 subfamilies of Chrysomelidae are recorded for St. Petersburg and Leningrad Province. The distribution of 219 species is proved by the author, 30 species are recorded for the region for the first time. For most species data on the phenology and ecology are given.