Systematics and distributions of the genera \u3ci\u3eCyrtusa\u3c/i\u3e Erichson, \u3ci\u3eEcarinosphaerula\u3c/i\u3e Hatch, \u3ci\u3eIsoplastus\u3c/i\u3e Horn, \u3ci\u3eLiocyrtusa\u3c/i\u3e Daffner, \u3ci\u3eLionothus\u3c/i\u3e Brown, and \u3ci\u3eZeadolopus\u3c/i\u3e Broun of the United States and Canada (Coleoptera: Leiodidae: Leiodinae: Leiodini)

The following genera of Leiodini (Coleoptera: Leiodidae: Leiodinae) of the continental United States and Canada are reviewed: Cyrtusa Erichson, with two species; Isoplastus Horn, with two species (one new); Liocyrtusa Daffner, with three species; Lionothus Brown, with five species (three new), and Zeadolopus Broun, with four species (all genera are in the “Cyrtusa genus group”) and Ecarinosphaerula Hatch, with one named species (in the “Leiodes genus group”). The new species are Isoplastus floridanus Peck and Cook of Florida; Lionothus bidentatus Peck and Cook of Texas and Oklahoma, Lionothus exiguus Peck and Cook of Florida and Texas, and Lionothus parvoculus Peck and Cook of Arizona and New Mexico. Bionomic data on the species are given, and complete known distributions are mapped