The new genus Speleopsocus Lienhard gen. n. is described for a strongly cave-adapted (troglobite) new species from Venezuela, Speleopsocus chimanta Lienhard sp. n. This is the first New World representative of the subfamily Prionoglaridinae. A special structure on the foretarsus of this species is described and interpreted as an antenna cleaner. The new species Sensitibilla etosha Lienhard and Holusa Sp. n., belonging to the subfamily Speleketorinae, is described from a cave in Namibia. This is the fourth species known of this genus which is endemic to southern Africa. Keywords: New genus, new species, cave fauna, troglobite, antenna cleaner, living fossils.