RODENTIA—SCIURINAE—-SCIURUS CAROLINENSIS. 
. 263 
List of Specimens. {Black and dusky squirrels, or not pure white beneath.) 
1 Uniformly black all over, with white tuft at the end of the tail. 
2 Uniformly black all over, without white tuft. 
s Uniformly black above; annulated dusky beneath. 
* Nearly uniform black, but with some annuli above and below. 
6 Dusky all over, and considerably annulated. 
6 Grayish above; annulated with rusty beneath in places. 
SCIURUS CAROLIlsENSIS ? ? 
Mexican Gray Squirrel. 
I have before me two skins of gray squirrels from Santa Catarina, in Mexico, which differ 
appreciably from any I have seen from within the United States. They are smaller than the 
southern gray, with longer and perhaps more bushy tail, and shorter and broader feet. The 
hair is coarser ; above, more decidedly black and gray ; beneath, very pure white, without any 
indication of the rusty line margining the white of the belly, which I have never found wanting 
before. The hairs of the tail are coarser ; the exterior white, very opaque, and of a yellowish 
tinge, instead of the bluish white of the common gray. The ears show no trace whatever of 
white on their convexity. 
Although this locality is very different from the usually recorded range of the gray squirrel, 
and the differences of these specimens are quite appreciable, I do not feel at liberty to establish 
them as distinct species, without further materials. 
The skull of this species presents some quite striking characteristics. In the first place, the 
small anterior upper molar, so universal in the gray squirrel, is here wanting entirely, as in 
the fox squirrels. The zygoma extends further backward, though the muzzle is shorter and 
