A new genus, Cerritulus gen. nov., with type species, C. forticrura sp. nov., are described from French Guiana based on a single specimen that is considerably distinct morphologically from all known Neotropical genera. The new genus is only partially similar to the enigmatic, monotypic Asian genera Ceylonspathius Belokobylskij and Termitospathius Beloko-bylskij, whose species were collected inside termite nests. We provide colour pictures for the type species of the above three genera.
Keywords: Hymenoptera, Neotropics, Ichneumonoidea, taxonomy, parasitoid wasp, South America.