Chaetodipus formosus Merriam, 1889 . N. Am. Fauna, 1:17.

TYPE LOCALITY: USA, Utah, Washington Co., St. George .

DISTRIBUTION: W Utah, Nevada, E California, and NW Arizona (USA), and E coast of Baja California to Bahia Concepcion (Baja California Sur, Mexico).

SYNONYMS: cinerascens Nelson and Goldman, domisaxensis Cockrum, incolatus Hall, infolatus Huey, melanocaudus Cockrum, melanurus Hall, mesembrinus Elliot, mohavensis Huey.

COMMENTS: Reviewed by Huey (1964). Included in Perognathus by Hall (1981:542) and earlier workers, but allocated to Chaetodipus by J. L. Patton et al. (1981) and Hafner and Hafner (1983).