Peromyscus madrensis Merriam, 1898 . Proc. Biol. Soc. Wash., 12: 16.

TYPE LOCALITY: Mexico, Nayarit, Tres Marias Isis., Maria Madre Isl .

DISTRIBUTION: Tres Marias Isis. (Mexico).

COMMENT: Considered a distinct species by Carleton, 1977:37, and Carleton, 1980:16. The relationship of madrensis to spicilegus and boylii requires further study; see Carleton, 1977:37. Hall, 1981:696, listed madrensis in boylii .