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VERTEBRATE ANIMALS OF THE UNITED STATES 



S. arizonensis Coues. Color grizzled gray; belly white; tail black 

 above, edged with white, brown beneath; length 540 mm.; tail 300 mm.; 

 hind foot 71 mm.: Arizona and New Mexico. 



2. Tamias lUiger. Chipmunks. Body small; tail short and not 

 bushy; large internal cheek pouches present; dentition i/i, 0/0, i/i, 



Fig. 180. — Skull of Sciitnts niger (from Elliot). 



2,/ 2,'- I species; terrestrial squirrels which make their nests in deep bur- 

 rows in the ground, in which they hibernate a longer or shorter time 

 in winter; stores of food layed up. 



T. striatus (L.). Common chipmunk. Color reddish brown, with 

 a middorsal black stripe and with a lateral whitish, longitudinal stripe 

 bordered above and below on each side by a black stripe; end of tail 

 blackish; rump ferruginous; length 250 mm.; tail 90 mm.; hind foot 

 33 mm.: eastern and central States; Upper Austral and Transition 



