Chaetodipus pernix J. A. Allen, 1898 . Bull. Am. Mus. Nat. Hist., 10:149.

TYPE LOCALITY: Mexico, Sinaloa, Rosario .

DISTRIBUTION: Coastal lowlands from S Sonora to N Nayarit (Mexico).

SYNONYMS: rostratus Osgood.

COMMENTS: Chromosomal and biochemical evidence suggests that the northern subspecies rostratus is specifically distinct from pernix (J. L. Patton et al., 1981) .