Abstract. 1. Historical literature review of all nomenclature associated with Oligonicella Giglio-Tos, 1915 is charted. 2. O. scudderi Saussure, 1870 is synonymized under Thespis parva (Gmelin, 1790), thereby placing Oligonicella in synonymy with Thespis Serville, 1831 and necessitating the transfer of all four species of the former under Thespis. 3. Paramusonia Rehn, 1904 is reinstated as a valid genus to incorporate those species previously held under Thespis with T. cubensis Saussure, 1869 recognized as its type species. 4. Paramusonia vicina (Saussure, 1872) is regarded as a distinct species. 5. Thespis parva (Gmelin, 1790) is proposed as a species complex. 6. Thespis is redescribed with an inclusion of a dichotomous key to species (males only). 7. The four recognized species of the newly formulated Thespis genus are diagnosed and treated.