MAMMALS 337 



length 209 mm.; tail 69 mm.; hind foot 38 mm.: Oregon to Mexico; 

 Sonoran zone; in deserts. 



Subspecies of A . leucunis 



A. I. cinnamomeus (Merr.). Upper parts uniform pale cinnamon, 

 lined with black: northern Arizona, southern California, Utah and 

 Colorado. 



A. I. inter pres (Merr.). Similar to A. leucurus, but darker; tail 

 bushy, with 2 free black bands; length 226 mm.; tail 80 mm.; hind foot 

 37 mm.: western Texas and eastern New Mexico. 



A. harrisii (Audubon and Bachman). Similar to A. I. leucurus: tail 

 iron gray above and below; length 230 mm.; tail 80 mm.; hind foot 40 

 mm. : southern Utah and Nevada into x\rizona and northwestern New 

 Mexico. 



A. nelsoni (Merr.). Color yellowish brown; under parts white; 

 length 228 mm.; tail 68 mm.; hind foot 40 mm.: San Joaquin Valley, 

 California, south to Bakersfield. 



6. Otospermophilus Brandt. Rock squirrels. Size large; colors 

 grayish or brownish, without stripes, mottled or faintly spotted; ears 

 small; tail long, flat and moderately bushy; dentition i/i, 0/0, 2/1, 2)/ i '■ 

 I species and several subspecies; terrestrial squirrels inhabiting the 

 western States from the Columbia River and Colorado south into 

 Mexico. 



0. grammurus (Say). Color mottled gray; length 500 mm.; tail 

 200 mm.; hind foot 60 mm.: central and southern Rockies and Great 

 Basin. 



Subspecies of 0. grammurus 



O. g. grammurus (Say). Eastern Colorado and south into Arizona, 

 southeastern California, New Mexico and western Texas. 



O. g. Utah (Merriam). Size small; back reddish: Wasatch Moun- 

 tains, Utah and western Colorado. 



O. g. buckleyi (Slack). Back and shoulders with much more black; 

 flanks grayish; size large: southern and western Texas. 



O. g. beecheyi (Richardsoni). Color mottled gray and brown, 

 indistinctly spotted; size smaller: western central California in Sacra- 

 mento and San Joaquin Valleys. 



O. g. douglasii (Rich.) . Like O. g. beecheyi, but with darker shoulders; 

 length 375 mm.: Columbia River south to San Francisco. 



O. g. nesioticus (Elliot). Like 0. g. beecheyi, but darker: Santa 

 Catalina and Santa Barbara Islands, California. 



