Six new species of Piezocerini (Coleoptera: Cerambycidae: Cerambycinae) are described: Alienosternus sanjacintero, Hemilissa bifasciata, Hemilissa erikae, Hemilissa claudiae, and Migorybia santossilvai from Colombia and Alienosternus wappesi from Bolivia. The genus Alienosternus Martins, 1976 is recorded for the first time for Colombia and Bolivia, and the genus Migorybia Martins, 1985 is recorded for the first time for Colombia. The geographical distribution of three species is expanded, and keys to species of Alienosternus and Hemilissa Pascoe, 1858 are provided.