GROUND SQUIRREL 



Brown Ground Squirrel. — Citellus spilosoma marginatus 

 (Bailey). 

 Differing from arens in darker color and heavier spotting 

 and from major in finer, sharper spotting, "Upperparts 

 bright cinnamon-brown, the whole back from ears spotted 

 with whitish, the spots conspicuously edged with black." 

 (Bailey) Total length, 9 inches; tail vertebra, 2.7 inches; 

 hind foot, 1.3 inches. Found in the Upper Sonoran Zone 

 of the Davis Mountain plateau of Texas. 



Park Ground Squirrel. — Citellus spilosoma pratensis (Aler- 

 riam). 

 Smaller than arens. Upperparts uniform russet hazel with 

 numerous whitish spots which have blackish posterior mar- 

 gins; tail above like back but mixed with yellowish and 

 blackish hairs on proximal half, blackish bordered with 

 yellowish brown on distal half, below, yellowish; underparts 

 dirty white. Total length, 7.9 inches; tail vertebra, 2.4 

 inches; hind foot, 1.2 inches. Found on the pine plateau 

 at north foot of San Francisco IMountain, Coconino County, 

 Arizona. 



Dusky Spotted Ground Squirrel.— C//£'//w^ spilosoma obsidi- 

 an us (Merriam). 

 Closely resembling pratensis but with longer feet and tail 

 and darker coloration. Ground color of upperparts dull 

 sepia brown, spots whitish but with black edging not very 

 conspicuous. Total length, 8.2 inches; tail vertebrce, 2.7 

 inches; hind foot, 1.3 inches. Found in the Cedar 'belt 

 northeast of San Francisco Mountain, Coconino County, 

 Arizona; west into Upper Sonoran Zone of New Mexico. 



Desert Ground Squirrel. — Citellus cryptospilotus (Merriam). 

 A small, pale form with only faint traces of spotting. Upper- 

 parts uniform buffy brown with yellowish or vinaceous 

 tinge, without spots; tail above like back, below yellower, 

 with subterminal black band which is more or less con- 

 cealed; underparts whitish. Total length, 7.6 inches; tail 

 vertebras, 2.4 inches; hind foot, 1.3 inches. Found on the 

 Painted Desert, Coconino County, Arizona. 



Northern Spotted Ground Squirrel; Kennicott Ground 

 Squirrel. — Citellus obsoletus (Kennicott). 

 Resembling the subspecies of spilosoma in general appear- 

 ance but not spotted so conspicuously. Ground color of 

 upperparts sandy gray with vinaceous tinge, indistinctly 

 spotted with grayish white; hands and feet whitish; tail 

 above like back, bushy at tip and banded with black, be- 

 low, pale ochraceous, banded with black near tip ' and 

 fringed with yellowish ; underparts whitish to creamy white. 

 Total length, 8.5 inches; tail vertebrse, 2.5 inches; hind foot* 

 1.3 mches. Found from western Nebraska to South 

 Dakota, Colorado, and Utah, in sandy country; limits of 

 range unknown. 



209 



