MAMMALS 333 



zones; westward into Nebraska and Oklahoma; several litters of young 

 a year, of 4 to 6 each; the food consists mainly of seeds and fruits, but 

 also of insects, snails, young birds and birds eggs, and other small 

 animals. 



Subspecies of T. striatus 



T. s. striatus (L.). Southeastern States. 



T. s. griseus Mearns. Size larger; color less reddish: upper Missis- 

 sippi Valley, westward of the Great Lakes; southward to eastern 

 Kansas and Missouri, 



Fig. 181. — Skull of Eutamias dorsalis (premolars and molars below, those of the upper jaw 

 being at the left) {from Elliot). 



T. s. lysteri (Richardson). Color pale and dull; rump yellowish 

 brown: New England to Lake Huron; Upper Transition and Lower 

 Canadian zones. 



T. s. venustiis Bangs. Upper surface dark gray ; size large : Oklahoma. 



T. s. fisheri Howell. Colors pale and gray : middle Atlantic States to 

 southern Virginia; westward to Ohio. 



3. Eutamias Trouessart. Western chipmunks. Similar to Tamias 

 in coloration; dentition i/i, 0/0, 2/1, 3/3; nail of thumb well developed: 

 about 57 species and subspecies; in western America. 



E. dorsalis (Baird) (Fig. 181). Color rusty gray with a dark brown 

 dorsal stripe; other stripes faint; under parts grayish white; length 237 

 mm.; tail 105 mm.; hind foot 35 mm.: Utah to the Sierras; southward 

 into New Mexico and Arizona. 



