Two Closely Related Leaf Beetle Genera Aulacia Baly, 1867 and Colaspoides Laporte, 1833 from Indonesia, Malaysia, and the Philippines, with Description of a New Genus Aulacioides gen. n. (Coleoptera, Chrysomelidae, Eumolpinae)

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.