A synopsis of all 23 spp. includes keys to both sexes, based primarily on caudal appendage morphology in males and morphology of the hind lobe of the prothorax in females, diagnoses, distributional notes and diagnostic illustrations. N. jurzitzai sp.n. (holotype 6: Brazil, Santa Catarina state, Nova Teutonia, 5 XI-I942, in UMMZ) is described, and the 6 and 9 of N. rufithorax Selys are described based on specimens from Peru.