vertebrae nearly equal to head and body. Rostral portions of skull 

 short and broad, nasals little narrowed posteriorly. 



Color. Summer Pelage. Upper parts, including nose and base 

 of tail, iron gray washed with yellow; crown and back blackish; flanks 

 washed with pale yellowish; sides of head gray mixed with black and 

 fulvous; under parts and feet huffy yellow to orange yellow, sometimes 

 suffused with rusty. Orbital ring varying from buffy white to ful- 

 vous; ears gray tinged with buff; outside of hind legs gray suffused 

 with rusty. Tail above black washed with pale or rusty yellow and 

 fringed with yellowish white, beneath with a median area of ferrugin- 

 ous orange or rusty rufous, bordered with a broad black band and 

 fringed with pale yellowish. 



Measurements. Average of five adults: Total length, 565.8; tail 

 vertebra', 279; hind foot, 79.2. 

 77. arizonensis. (Seii/rus). Cones. .\m. Nat.. i<S67, p. 357. 



Fig. 14. SciuRus (Araeosciurus) arizonensis. 



No. 1705 Field Columbian Museum Coll. Nat. size. 



