150 Nelson — Descriptions of New Squirrels from Mexico. 



with broad median area bright ochraceous bordered with black and edged 

 with white. 



Meamirements of type. — Total length, 535; tail vertebrae, 273; hind f5ot, 69. 



Slcnll (•hnraclers. — Skull smaller and lighter than in S. p. hernandezi ; 

 bullae smaller ; outer end of nasals broadened, producing an inflated tip. 



Niimher of spccimm.s ernmiried. — Five. 



General nohs. — The brighter colors of the nape and rump patches, the 

 paler back, the reddish color of basal parts of hairs on tail, and the buffy 

 underparts make a combination of characters which easily distinguish 

 this form from its allies. One of these five specimens before me has the 

 underparts pure white ; and a half-grown specimen has the underside of 

 the tail dull yellowish gray. The rump and nape patches while distinct 

 are scarcely darker than the underside of the tail. 



