Mycomystes nigriventris sp. nov. (Coleoptera: Erotylidae: Tritomini) from South America, with insights into the genus Mycomystes Gorham.

Mycomystes nigriventris sp. nov. (Erotylidae: Tritomini) is described from South and Southeast Brazil.

Xalpirta mauryi sp. nov. (Coleoptera: Erotylidae: Tritomini) from Southeast Brazil.

Xalpirta mauryi sp. nov. (Erotylidae: Tritomini) is described from Parque Nacional do Itatiaia (in the state of Rio de Janeiro) and Campos do Jordão (in the state of São Paulo), Southeast Brazil.