A new species, Dicyrtoma (Ptenothrix) castanea Snider, is described from South Carolina. It shares morphological characteristics with Dicyrtoma (Ptenothrix) vittata (Folsom) and Dicyrtoma (Ptenothrix) renateae n.sp. (Snider 1985). Separation of D. castanea from those species is accomplished by color pattern and presence of clavate subapical filaments on the unguiculi. The type locality is Aiken County, South Carolina, litter in low, mixed hardwood forest.