The present publication deals with the moth genus Hemiceras Guenée, 1852, which has gained a poor reputation as a taxonomically difficult group. The last comprehensive description of American Notodontidae by Draudt (1932-1933) in Seitz contains 167 species (including 2 species in the genus Schausiades), with 88 species illustrated. A checklist of neotropical Notodontidae by Becker (2014) lists 201 species in the genus Hemiceras. Fifty-six taxa are newly synonymized. Seven lectotypes and one neotype designations stabilize the nomenclature by fixing the identity of these species. Out of 210 species, currently treated as valid, 51 are newly described, as are ten subspecies.