FIELD BOOK OF MAMMALS 



the white underparts by a band of cinnamon hke rump ; hands 

 and feet yellowish white to buffy white; tail blackish, tipped 

 with whitish above, white below, narrowly banded with 

 black. 



Underparts. — Glistening white. 



Immature striped like adults, but much grayer. 



Measurements. — Sexes of equal size. Total length, 8.5 

 inches; tail vertebrae, 3 inches; hind foot, 1.5 inches. 



Geographical Distribution. — Arid western and southwestern 

 states from Oregon south into Mexico. 



Food. — Seeds, grains, and green vegetation; occasionally 

 insects; meat when obtainable. 



Enemies. — Snakes, Hawks, Coyotes, Foxes, Bobcats, 

 Weasels, Badgers, and most of the small carnivores. 



Species and Subspecies of the Genus Ammospermophilus 



Antelope Ground Squirrel. — Ammospermophilus leucurus leu- 



curiis (Merriam). 

 As described. Found in the Sonoran Zone from Mexico 

 north to Mono County, California. 



Cinnamon Ground Squirrel. — Ammospermophilus leucurus 

 cinnamomeus (Merriam), 

 Resembling typical leucurus in size and color pattern, but 

 upperparts with a decided cinnamon-brown tone. Total 

 length, 8.5 inches; tail vertebrae, 2.5 inches; hind foot, 1.6 

 inches. Found in northern Arizona, southern Utah, south- 

 western Colorado, and northeastern New Mexico; Oregon(?) 



Ammospermophilus leucurus vinnulus (Elliot) = Ammo- 

 spermophilus leucurus cinnamomeus. 



El Paso Ground Squirrel; Texas Antelope Squirrel. — Ammo- 

 spermophilus leucuriis interpres (Merriam). 

 Darker and more richly colored than typical leucurus and 

 with more gray on head; pelage longer and more silky. 

 Size as in typical leucuriis. Found in the "Sonoran Zone, 

 in the Eastern Desert Tract of New Mexico and Texas." 

 (Mearns). 



Nelson Ground Squirrel. — Ammospermophilus nelsoni nelsoni 

 (Merriam). Plate XXIII. 

 Larger and paler than leucurus. Upperparts, in summer, 

 dull fulvous or yellowish brown, pelage blackish at base; 

 lateral stripe white, with ochraceous tinge; tail above, black 

 fringed with white, below, buffy white; underparts buffy 

 white. In winter, somewhat darker on upperparts. Total 

 length, 9 inches; tail vertebrae, 3 inches; hind foot, 1.6 

 inches. Found in the Lower Sonoron Zone in California 

 from vicinity of Bakersfield north into Merced County, 

 west to San Luis Obispo County. 



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