Thomasomys dorsalis (Hensel, 1872) . Abh. Konigl. Preuss. Akad. Wiss. Berlin, p. 42.

TYPE LOCALITY: Brazil, Rio Grande do Sul Prov .

DISTRIBUTION: S. and E. Brazil; N.E. Argentina (AL).

COMMENT: Includes collinus and sublineatus; see Cabrera, 1961:428; Walker et al., 1975:766, listed collinus and sublineatus as distinct species, without comment. Reviewed by Massoia, 1962, Physis, 23(64):27-34. Delomys was considered a distinct genus by Avila-Pires, 1960, Arq. Mus. Nac. Rio de J., 50:32-33, and AvilaPires, 1960, Bol. Mus. Nac. Rio de J., 220:1-6; Cabrera, 1961:425, 428-429, included Delomys in Thomasomys as a synonym. RHP considers Delomys a subgenus which probably merits generic status.

ISIS NUMBER: 5301410008055007001.