Chaetodipus arenarius Merriam, 1894 . Proc. California Acad. Sci., ser. 2, 4:461.

TYPE LOCALITY: Mexico, Baja California Sur, San Jorge, near Comondu .

DISTRIBUTION: Baja California (Mexico).

SYNONYMS: albescens Huey, albulus Nelson and Goldman, ambiguus Nelson and Goldman, ammophilus Osgood, dalquesti Roth, helleri Elliot, mexicalis Huey, paralios Huey, sabulosus Huey, siccus Osgood, sublucidus Nelson and Goldman.

COMMENTS: Reviewed by Huey (1964) and Lackey (1991a, Mammalian Species, 384, as Perognathus arenarius). Includes dalquesti, considered a full species by Hall (1981).