The generic concept of Calliscelio Ashmead is expanded to include variation in the shape of the metascutellum, the development of propodeal carinae, the presence of an epomial carina, the presence of malar striae, and the position of the toruli on the frons. This expansion follows circumscription of the genus based on the prioniform sensillum on the mandible, a character that is unique within Platygastroidea. We consider the prioniform state of the sensillum to be a synapomorphy for the genus, and treat Crama Galloway, Lispoteleia Galloway, Xentor Masner and Johnson, and Yunkara Galloway as junior synonyms of Calliscelio; the species of these genera are transferred herein. Calliscelio yunkara Talamas is provided as a replacement name for Yunkara inornata Galloway. A lectotype is designated for Calliscelio albicoxa (Dodd).