T,T,8 VERTEBRATE ANIMALS OF THE UNITED STATES 



3,2 Upper premolar i in number, making 4 grinders on each side in 

 upper jaw (Fig. 180). 



bi In the eastern and central States; common fox squirrel S. niger. 



b2 In Arizona S. apache. 



S. arizonensis. 



S. Jiudsonicus Erxleben. Red squirrel. Color reddish brown 

 above and whitish beneath; tail relatively narrow and short; ears 

 tufted in winter; length 315 mm.; tail 130 mm.; hind foot 47 mm.: 

 northern America from Labrador to Alaska and British Columbia; 

 southward to Virginia and Tennessee; westward to Utah; several litters 

 of young raised a year, from 4 to 6 each. 



Subspecies of S. hudsonicus 



S. h. hudsonicus Erx. Colors pale; fringe of tail yellowish: east- 

 ward of Rocky Mountains in Canadian and Hudsonian zones. 



S. h. gymnicus Bangs. Size small; length 290 mm.; outer fringe of 

 tail red; colors deep; belly gray in winter: northeastern States, Canadian 

 zone; southward into New York State. 



S. h. loguax B Sings. Outer fringe of tail yellowish; colors pale; 

 belly pure white at all seasons: eastern States, Transition and Upper 

 Austral zones. 



S. h. minnesota Allen. Size large; colors pale; under side of tail 

 gray; length 345 mm.: Minnesota to Iowa. 



S. h. dakotensis Allen. Size large; colors very pale; center of tail 

 yellowish red: Black Hills. 



S. h. baileyi Allen. Fringe of tail black; dorsal band pale; size 

 large: central Wyoming and eastern Montana. 



S. h. ventorum Allen. End of tail black; size large: Yellowstone 

 Park region into the Wasatch Mountains. 



S. h. richardsoni Bachman. Upper surface of tail mostly black; 

 size large: western Montana into eastern Washington and Oregon. 



S. h. streatori Allen. Terminal third of tail black: Columbia River, 

 northward into British Columbia. 



S. fremonti Audubon & Bachman. Similar to S. hudsonicus, but 

 larger; dorsal band pale yellowish rufous; length 335 mm.; tail 140 mm.; 

 hind foot 55 mm.: Colorado, Utah, New Mexico and Arizona; Canadian 

 zone. 



Subspecies of S. fremonti 



S.f .fremonti Aud. & Bach. Color grayish; white beneath : mountains 

 of Colorado and northeastern Utah. 



S.f. lychnuchus Stone & Rehn. Color dull ferruginous; fringe of tail 

 black: White Mountains, New Mexico. 



