Phoneutria fera Perty, 1833 is redescribed, based on 44 specimens (male and female) and Ctenus sus Strand, 1910 is synonymized, as it represents the male of fera. The synonymy of Phoneutria reidyi (Pickard-Cambridge, 1897) with Phoneutria rufibarbis Perty, 1833 is discussed and reidyi is revalidated.