FIELD BOOK OF MAMMALS 



as head and body; ears small; claws long and slender; tail 

 round, slightly bushy toward tip; pelage short and harsh; 

 iris hazel. Appearing in two color phases. Reddish phase: 

 upperparts nearly uniform cinnamon with vinaceous tinge, 

 spotted with small, irregular, whitish spots arranged more 

 or less in longitudinal series ; tail cinnamon like back above, 

 more yellowish below; hands and feet whitish to pale yel- 

 lowish; underparts and ring about eye white; iris hazel. 

 Grayish phase: like reddish phase but ground color rusty 

 brownish gray. Total length, 9.6 inches; tail vertebrae, 

 3 2 inches; hind foot, 1.4 inches. Found in "Sonoran Zone 

 in southwestern Texas and the adjacent parts of Mexico 

 —the Eastern Desert Tract." (Mearns) West into Lower 

 Sonoran of New Mexico. 

 Padre Island Ground Squirrel. — Citellus spilosoma annectens 



(Merriam). ,11 • 1 -n j 



"Upperparts dull grayish brown; back beset with ill-de- 

 fined buffy spots, margined posteriorly with dusky in un- 

 worn pelage; underparts soiled white. Eyehds white. 

 Tail concolor with back or a little more fulvous, its distal 

 half or two-thirds bordered with a subapical black band, 

 beyond which the tips of the hairs are buffy ochraceous." 

 (Merriam) Total length, 10 inches; tail vertebrae, 3.6 

 inches- hind foot, 1.5 inches. Found on "Southern coast 

 region 'of Texas (Padre Island, Mustang Island, and ad- 

 jacent mainland.)" (Mearns) 

 Apache Ground Squirrel.— a7e//«5 sptlosoma macrosptlotus ■ 



(Merriam). . , ^^^ <■ v r,^ ^- j 



"Ground color russet-brown, mixed with a tew light-tipped 

 hairs Spots large, roundish, and far apart. Tail concolor 

 with the body on its proximal half; yellow, ringed with 

 black on terminal half; and yellow beneath. Feet and 

 undersurface white." (Mearns: Mamni. Mex. Boundary) 

 Gray phase: drab gray ground color washed with hoary; 

 whitish markings crowded and tending to form transverse 

 wavy bars. Total length, 8.8 inches; tail vertebrae, 3 

 inches; hind foot, 1.2 inches. Found m the Sonoran 

 Zone in the Elevated Central Tract." (Mearns), of south- 

 ern Arizona; Lower Sonoran Zone of New Mexico. 

 Large Spotted Ground Squirrel. — Citellus spilosoma major 

 (Merriam). . ^ ., /^ j 



One of the largest of the subspecies of sptlosoma. Ground 

 color of upperparts light brown, spots indistinct and most 

 numerous on rump; nose tinged with pale fulvous; tail pale 

 reddish brown on proximal half above, buffy brown on ter- 

 minal half, with submarginal black band, bordered with 

 pale buff below buffy; underparts white. Total length, 

 Q s inches; tail vertebrae, 3.2 inches; hmd foot, 1.4 inches. 

 Found in Upper Sonoran Zone from eastern New Mexico 

 north into Colorado as far as the valley of the Arkansas 

 River. 



208 



