The eastern Nearctic pselaphine genus Custotychus Park and Wagner consisting of 14 species is revised, with ten new species being proposed: C. carloritaorum Chandler and Geromini new species, C. cavei Chandler and Geromini new species, C. chickasaw Chandler and Geromini new species, C. leei Chandler and Geromini new species, C. lobatus Chandler and Geromini new species, C. natchez Chandler and Geromini new species, C. rothorum Chandler and Geromini new species, C. spinosus Chandler and Geromini new species, C. turnbowi Chandler and Geromini new species, and C. watrousi Chandler and Geromini new species. Tychus spiculifer Casey is placed as a junior synonym of T. verticalis Casey, new synonymy. A diagnostic key and figures are provided for identification of the species.