The longicorn beetle tribe Cerambycini Latreille, 1802 (Coleoptera: Cerambycidae: Cerambycinae) in the fauna of Asia. 4. New or little-known taxa, mainly from Indochina and Borneo, with reviews or annotated checklists of species of some genera

Full generic statuses of Plavichydissus Pic, 1946, stat. rest., Laomargites Pic, 1923, stat. rest. and Lamellocerambyx Pic, 1923, stat. rest. are restored. Reviews of these genera, as well as keys to species of the former two are given. Annotated checklists of the Asian species of the genera Pachydissus Newman, 1838 and Margites Gahan, 1891, as well as of all species of Diorthus Gahan, 1891 are presented. The following new species are described and new specific combinations established: Plavichydissus grossepunctatus (Gressitt et Rondon, 1970), comb. n., P. irinae sp. n. (Vietnam), P. aggregatus (Holzschuh, 1999), comb. n., P. sulcicollis (Gahan, 1893), comb. n., P. myanmarensis sp. n. (Myanmar), P. makarovi sp. n. (Thailand), P. nataliae sp. n. (Vietnam), P. decipiens (Holzschuh, 1989), comb. n., P. penangensis sp. n. (Western Malaysia), P. sodalis (Holzschuh, 1999), comb. n., P. dembickyi sp. n. (Western Malaysia), Pachydissus murzini sp. n. (Yunnan, China), P. borneoensis sp. n. (Eastern Malaysia), Laomargites fedorenkoi sp. n. (Vietnam), Dymasius tatianae sp. n. (Eastern Malaysia), D. solodovnikovisp. n. (Thailand), D. barclayi sp. n. (Western Malaysia), Zatrephus jakli sp. n. (Java, Indonesia), Diorthus kabakovi sp. n. (Afghanistan), Tapinolachnus uniformis (Pic, 1933), comb. n., T. xyliae (Fisher, 1940), comb. n. The following specific combinations are restored: Plavichydissus semiplicatus (Pic, 1926), comb. rest., P. rufipennis (Pic, 1923), comb. rest., Laomargites singularis Pic, 1923, comb. rest. and Lamellocerambyx laosensis Pic, 1923, comb. rest. The synonymization of the genus Diorthus with the genus Tapinolachnus J. Thomson, 1865 is confirmed as being wrong. The following new synonymy is established: Tapinolachnus = Mimoderolus (Aeolesthes subgen.) Pic, 1933, syn. n. (non syn. pro Derolus Gahan, 1891). Dymasius strigosus J. Thomson, 1864, sp. rest. is resurrected from the synonymy with Dymasius macilentus (Pascoe, 1859). The genus Derolydnus Hüdepohl, 1989 is reported from Indochina for the first time. New records of a number of species from other genera are given as well, thus one way or another extending their known distribution areas, sometimes very significantly so. The lectotypes of Margites modicus Gahan, 1906, Diorthus sericeus Gardner, 1939 and Tapinolachnus xyliae (Fisher, 1940), comb. n. are designated. Abundant pictures of the species studied, including numerous type specimens, are provided