A new genus and species of Endomychidae from northeastern North America, Hadromychus chandleri, is described and illustrated. The genus is likely the adelphotaxon (sister-group) to Danascelis Tomaszewska from Pakistan, based on the following character states: antennal insertions hidden, swollen antennomere 9 of male, paired foveae on each side of the pronotal base, pronotum lacking a thick basal bead and sublateral sulci, unicarinate mesosternum, absence of metasternal discrimen, absence of sutural stria on elytron, and slightly lobed tarsomeres. Pending a cladistic analysis of the Endomychidae, both genera are best placed at present in Epipocinae, though it is possible they may be sister taxa to the subfamily Leiestinae based on the sharing of antennal insertions hidden in dorsal view, reduced prosternal process, weakly produced anterior pronotal angles, and slightly lobed tarsomeres. Sexual dimorphism in Endomychidae is discussed briefly.