FIELD BOOK OF MAMMALS 



Found in "Valleys of western and central Nevada, from 

 Flowing Springs, western Humboldt County, south to 

 Cloverdale and Monitor Valley, west to Honey Lake, Cal." 

 (Bailey) 



Yellow Pocket Gopher. — Thomomys perpallidus aureus (Allen). 

 Color golden buff, ear small. Upperparts (winter) bright 

 orange-buff, variable in shade, sometimes with dusky wash 

 along dorsal region; dusky to blackish on nose and about 

 ear; feet and tail creamy white; underparts creamy white. 

 Summer pelage like winter but a trifle darker. Total, 

 length, males, 9.6 inches, females, 8.9; tail vertebrae, males, 

 2.9 inches, females, 3.1; hind foot, males, 1.24 inches, 

 females, 1.20. Found in "Desert region of southern Nevada 

 southern Utah, western Colorado, central and northwestern 

 New Mexico, and northern and western Arizona." (Bailey) 



Jicarilla Pocket Gopher. — Thomomys perpallidus apache 

 (Bailey). 

 Dark in color, large in size (for this group). Upperparts dull 

 sooty gray, with light wash of dull ochraceous, a dark dorsal 

 band of blackish faintly indicated ; tail brownish to blackish 

 for dorsal half or three-quarters, rest white in marked con- 

 trast ; feet white ; underparts uniform with upper, except for 

 white on lips and less often on chin. Total length, males and 

 females, 9.2 inches; tail vertebrae, 3 inches; hind foot, 1.33 

 inches. Found in "Transition Zone in northeastern 

 Arizona, northwestern New Mexico, and southwestern 

 Colorado." (Bailey) 



White Mountains Pocket Gopher. — Thomomys melanotis 

 Grinnell. 

 Color very pale and similar to that of typical perpallidus , 

 but with more dusky nose and mouth and with more 

 extensive, slaty black ear patch; ear extremely small, 

 densely clothed with fine black hairs; general size medium. 

 Total length, males, 9.5 inches, females, 8.8 inches; tail 

 vertebrae, males, 3.1 inches, females, 2.7 inches; hind foot, 

 males, 1.2 inches, females, i.i inches. Found at high eleva- 

 tions (10,000-10,500 feet) in the White Mountains, Mono 

 County, California. 



Cabezon Pocket Gopher. — Thomomys cahezonce Merriam. 

 Resembling perpes in color but with larger ears. Upperparts 

 (summer) from buffy ochraceous to dull brownish dusky to 

 blackish on nose, lips, and about ears; underparts varying 

 from creamy white to buffy or salmon. Total length, males, 

 8.8 inches, females, 8.3; tail vertebrae, males, 3.2 inches, 

 females, 2.8; hind foot males, 1.20 inches, females, 1.14. 

 Found from "San Gorgonio Pass, southern California, 

 south to Cabezon." (Bailey) 



Owens Lake Pocket Gopher. — Thomomys operarius Merriam. 

 ResembHng aureus in color but differentiated by short, 

 heavy rostrum and other skull characters. Upperparts pale 

 ochraceous to rich buff; gr^y to dark gray about ear; feet 



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