Camptochaeta prolixasp. n. (Diptera, Sciaridae) is described from caves in Nevada, and three other congeneric species are recorded from caves in Nevada and Arkansas, United States. The new species shows some indication to a subterranean mode of life, including long antenna and legs, and in some specimens, reduction of the eye bridge.
Keywords: Camptochaeta; Diptera; Sciaridae; USA; caves; new records; new species.