Chaetodipus Merriam, 1889 . N. Am. Fauna, 1:5.

TYPE SPECIES: Perognathus spinatus Merriam, 1889 .

SYNONYMS: Burtognathus Hoffmeister.

COMMENTS: Species revised by Merriam (1889) and Osgood (1900) under the generic name Perognathus; both authors considered Chaetodipus as a valid subgenus (see also Hall, 1981). Raised to generic status by Hafner and Hafner (1983), an action followed by most subsequent authors. Includes Burtognathus (see Hoffmeister, 1986), defined as a subgenus to contain the single species C. hispidus . Chromosomal and biochemical systematics provided by Patton (1967a) and J. L. Patton et al. (1981).