Rheomys Thomas 1906 . Ann. Mag. Nat. Hist., ser. 7, 17:421.

TYPE SPECIES: Rheomys underwoodi Thomas, 1906 .

SYNONYMS: Neorheomys .

COMMENTS: Ichthyomyine. All named forms suggested as conspecific under trichotis by Hershkovitz (1966b) but Voss (1988) recognized four species. Formerly included trichotis (Tate, 1932/t), a species later designated as the type of Chibchanomys (Voss, 1988) . Neorheomys, diagnosed as a subgenus (Goodwin, 1959a), was placed in full synonymy by Voss (1988). Separation from lchthyomys questioned by Ellerman (1941) and Hall (1981); relationships and generic stature illuminated by Voss (1988).