FiG. 13. SCIURUS (Otosciurus) aberti. 

 No. 2;2g Field Columbian Museum Coll. Nat. size. 



Color. Entire upper parts gray; under surface of bod}- and 

 limbs white; upper part of feet gray, toes white; ears gray with length- 

 ened tufts, black mixed with gray, and chestnut. Tail same above 

 and below, gray bordered with black and fringed with white. 



Mfasurements. Total length, 495; tail vertebra?, 215; ear from 



occiput, 22; hind foot, 61. 



E. Araeoscinrns, Nelson. 



Premolars, i^. Skull broad, flat, not contracted posteriorly; 

 I— I ' ' '^ -' 



depressed between orbits; nasals long as interorbital width, extend- 

 ing posteriorly to end of premaxillaries. 



76. apache. (Sciiiriis), Allen, Bull. Am. Mus. Nat. Hist., 1893, p. 29. 



griseojlavus, Thomas, (nee Gray), Proc. Zool. Soc, 1882, p. 372. 



Type locality. Northern Chihuahua, Mexico. 



Geogr. Distr. Chihuahua Mountains, Arizona, south into Mex- 

 ico in the Sierra Madre to Durango. 



Genl. Char. Size large, back yellowish gray; tail long, bushy, 



