First report of the Euconnus Thomson subgenus Cladoconnus Reitter in the New World, represented by thirteen new Appalachian species (Coleoptera, Staphylinidae, Scydmaeninae).

Thirteen new species of Euconnus Thomson (Staphylinidae: Scydmaeninae: Glandulariini) are described from the southern Appalachian Mts, USA: Euconnusmegalops sp. nov. , E.vexillus sp. nov. , E.cumberlandus sp. nov. , E.vetustus sp. nov. , E.adversus sp. nov. , E.astrus sp. nov. , E.cultellus sp. nov. , E.falcatus sp. nov. , E.cataloochee sp. nov. , E.kilmeri sp. nov. , E.draco sp. nov. , E.tusquitee sp. nov. , and E.attritus sp. nov. These share a number of morphological characters with the Old World subgenus Cladoconnus Reitter, representing a diversification of species distinct from anything previously known from the western hemisphere. Most of the species occur at higher elevations, some at the tops of the region's highest mountains, and a few are single-peak endemics. No females of these species are winged, and in several species neither sex is winged. A preliminary phylogeny suggests the wingless species represent a clade within a clade of wing-dimorphic species.