Abstract

A catalogue of the species of Platylabini from the south-eastern United States is presented, with an updated list of the species, a review of their distribution, and the first illustrated key to the genera and species. Cyclolabus gracilicornis gracilicornis (Provancher, 1886) is newly recorded for the province of Nova Scotia (Canada), while eight species are recorded for the first time for the following US states: Amboplisus ornatus (Cresson, 1868) for Georgia; Asthenolabus canadensis (Cresson, 1877) for West Virginia; Linycus exhortator thoracicus (Cresson, 1864) for Virginia, Neolinycus michaelis Heinrich, 1971 for Florida; Platylabus clarus (Cresson, 1867) for Alabama, Virginia and West Virginia; Platylabus opaculus americanus Heinrich, 1962 for North Carolina; Probolus detritus (Brullé, 1846) and Tropicolabus foxi (Davis, 1898) for Florida. Based on newly discovered and already published material, a new subspecies synonym has been recognised: Neolinycus michaelis arkansae Heinrich 1975 is regarded as a junior synonym of Neolinycus michaelis michaelis Heinrich, 1971, and the previous subspecies synonymy that regarded Neolinycus michaelis georgianus Heinrich, 1972 as a junior synonym of the nominate subspecies has been confirmed and explained. The female of Tropicolabus foxi is described for the first time, marking the first record of the species since its original description. Nomenclatural notes and extensive comments for each species are provided, as well as a key to the tribes of Ichneumoninae of North America, and to the genera and species of Platylabini from the south-eastern United States.