New species are described in the tribe Piezocerini: Gorybia rondonia sp. nov. from Brazil (Rondônia) and G. bahiensis sp. nov. from Brazil (Bahia); in the tribe Hexoplonini: Calycibidion rubricolle sp. nov. from Brazil (Bahia); in the tribe Ibidionini, Tropidina: Tropidion argentina sp. nov. from Argentina (La Rioja) and T. boliviensis sp. nov. from Bolivia (Santa Cruz); in the tribe Rhinotragini: Ommata (Ommata) albitarsis sp. nov. from Brazil (Rondônia); and in the tribe Rhopalophorini: Cosmisoma viridescens sp. nov. from Brazil (Bahia). To validate the tribal names, Hexoplon Thomson, 1864 and Tropidion Thomson, 1867, are here designated type genera of Hexoplonini and Tropidiina, respectively.
