Perognathus flavus Baird, 1855 . Proc. Acad. Nat. Sci. Philadelphia, 7:332.

TYPE LOCALITY: USA, Texas, El Paso Co., El Paso .

DISTRIBUTION: SW Great Plains and intermountain plateaus from South Dakota, E Wyoming, and SE Utah (USA) south to Sonora and Puebla (Mexico).

SYNONYMS: bimaculatus Merriam, bunkeri Cockrum, fuliginosus Merriam, /«sews Anderson, goodpasteri Hoffmeister, hopiensis Goldman, médius Baker, mexicanus Merriam, pallescens Baker, parviceps Baker, piperi Goldman, sanluisi Hill, sonoriensis Nelson and Goldman.

COMMENTS: Revised by Baker (1954); subspecies listed by Hall (1981). Wilson (1973) considered merriami conspecific, but Lee and Engstrom (1991) presented evidence of sympatry with limited hybridization.