Monograph of 



305 



above, rusty grey, white beneath, not subject to vary in color. 

 Dental formula: Incis. |; Can. -»^; moL f f j — 22. 



This has been invariable considered as identical with the 

 Northern Grey Squirrel, but it is undoubtedly a distinct species. 

 The head of the S. Carolinensis is shorter, and the space be- 

 tween the ears proportionately broader ; and the nose is sharper. 

 The small anterior molar in the upper jaw is permanent. It 

 is considerably larger than in S. Icucotis, and all my specimens, 

 which indicate that the animal was more than a year old, instead 

 of the small, thread-like, single tooth of the S. leticotis, have a 

 distinct double tooth with a double crown ; the other molars are 

 in form not unlike those of the other species, but are shorter and 

 smaller j the upper incisors are nearly a third shorter. The body 

 is shorter, less elegant in shape, and has not the appearance of 

 sprightliness and agility, for which the other species is so distin- 

 guished. The ears, which are nearly triangular in shape, are so 

 slightly clothed with hair internally that they may be said to be 

 nearly naked : externally they are sparsely clothed with short 

 woolly hair, which, however does not extend beyond the mar- 

 gins, as in the other species. The nails are shorter and less 

 hooked. The tail is shorter and does not present the broad dis- 

 tichous appearance of the other. This species is not subject to 

 run into varieties. 



DIMENSIONS 



In. Lines. 



9 6 



7 4 



9 6 



6 



1 3 



2 6 

 5 



Length of head and body, - « . . 



Ditto of tail, {vertehrm^) - .. 



Ditto to point of hair, - - - ^ « 

 Height of ear, -«.-.. 



Palm to end of middle claw, - - - - 



Heel to end of middle nail, - - . . 



Length of fur on the back^ - - - - 



Breadth of tail with hairs extended, - - 3 



Color. — Teeth light orange ; nails brown, lighter at the ex- 

 tremities ; whiskers black ; nose and cheeks, and around the 

 eyes, a slight tinge of rufous grey. The fur on the back is for 

 three fourths its length, dark plumbeous, then a slight marking 

 of black, edged with brown in some hairs and black in others, 

 giving it, on the whole upper surface, a uniform dark ochreous 



Vol. XXS.TII3 No. 2— July-October, 1839. 39 



