A revision of the genera Lachaerus and Clavidesmus (Coleoptera, Cerambycidae, Lamiinae, Onciderini)

ABSTRACT The revision is presented based on external and internal morphology; the Brazilian species are redescribed. The male characters of Clavidesmus are presented for the first time. New synonyms proposed: Orteguaza lichenigera Lane, 1958 junior synonym of Clavidesmus metallicus (Thomson, 1868). New combinations: Clavidesmus rubigineus Dillon & Dillon, 1949 and Clavidesmus monnei Giorgi, 1998 to Lachaerus Thomson, 1868. New country record is reported: Lachaerus fascinus (Audinet-Serville, 1835) for Argentina. The Onciderini genera that share the swollen condition of the third antennomere could be separated in two groups: (1) Lachaerus and Clavidesmus, by the presence of a swollen antennomere in both sexes; (2) Eudesmus Audinet-Serville, 1835, Psyllotoxus Thomson, 1868, Oncideres Audinet-Serville, 1830, Taricanus Thomson, 1868 and Periergates Lacordaire 1872, by the presence of a swollen antennomere only in males.