The Genus Oryssomus is revised and illustrations of pertinent characters are provided. A key to the genera of Oryssomini and to the species of Oryssomus and Gordonoryssomus are added. Gordonoryssomus. gen.n. is described: type species: Oryssomus deyrollei Crotch, 1874. A new species of Oryssomus, O. unimaculatus, sp.n.. from Amazonas, Brazil and three of Gordonoryssomus, G. nigrus, sp.n.. from Santa Cruz, Bolívia, G. nigripilosus. sp.n., from Espirito Santo, Brazil and G. delicatus, sp.n.. from Rio de Janeiro, Minas Gerais, Santa Catarina and Rio Grande do Sul, Brazil, are described.
Coccinellidae; Oryssomini; Oryssomus; Gordonoryssomus gen.n.; taxonomy