| Summary: | Thirteen new species of Euconnus Thomson (Staphylinidae: Scydmaeninae: Glandulariini) are described from the southern Appalachian Mts, USA: Euconnus megalops 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.
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