Peromyscus simulus Osgood, 1904 . Proc. Biol. Soc. Washington, 17:64.

TYPE LOCALITY: Mexico, Nayarit, San Blas .

DISTRIBUTION: Coastal plain of Nayarit and S Sinaloa, Mexico.

COMMENTS: Previously classified as a geographic race of P. boylii (Osgood, 1909; also see Hall, 1981); elevated to species by Carleton (1977). Relationships addressed by Bradley and Schmidly (1987) and Carleton et al. (1982). P. boylii species group.