MAMMALS 



341 



Subspecies of S. aberti 



S. a. aberti Wood. Mountains of northeastern Arizona and western 

 New Mexico. 



5. a. ferreus True. No reddish dorsal band: northern Colorado. 



S. a. mimus Merr. Reddish dorsal band present: southwestern 

 Colorado; northern New Mexico. 



Fig. 180. — Skull of Sciurus niger {from Elliot). 



S. kaibabensis Merr. Similar to S. aberti; belly black: region of 

 the Grand Canyon, Arizona; 2 annual litters of 3 or 4 each. 



S. niger L. Fox squirrel (Fig. 180). Color reddish brown above and 

 rusty or rusty white beneath; rarely (in the south) black; tail long and 

 bushy; length 590 mm.; tail 270 ram.; hind foot 73 mm.; weight 2 or 

 3 lbs.: eastern and central States; westward to the eastern border of 

 the Great Plains; usually i Utter a year of 2 to 4 young. 



