_Perognathus goldmani_ Osgood and _Perognathus artus_ Osgood from southern Sonora, northern Sinaloa and adjoining parts of Chihuahua and Durango, are two named kinds of the _Perognathus intermedius_ group of pocket mice, of the subgenus _Chaetodipus_. Until now the two kinds have been treated in the literature as two species. In both _goldmani_ and _artus_ the upper parts are Ochraceous-Buff (capitalized color terms after Ridgway, Color Standards and Color Nomenclature, Washington, D. C., 1912) having a strong admixture of black. The lateral line is Ochraceous-Buff, and the underparts are white. _P. goldmani_ is larger than _P. artus_ (see measurements beyond) and has more inflated tympanic …
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