7 species (see text) Rhaucus is a genus of harvestmen in the family Cosmetidae.

The genus is endemic to the northern Andes in Colombia.

[1] A previously synonymized species, R. papilionaceus, was revalidated in 2018.

[1] There, the type species Metarhaucus fuscus Pickard-Cambridge 1905 became a junior synonym of Rhaucus serripes (Simon, 1879)), consequently leading to Metarhaucus = Rhaucus.

Other species then placed in Metarhaucus at that time and similarly affected by the same synonymy have since been re-formalised into other genera).