62 NEW SPECIES OF AMERICAN QUADRUPEDS. 
and in the dried specimen appears much flattened ; 
the fur is soft, smooth, and lustrous. 
There is a line of white above and beneath the 
eye-brows. The fur on the whole of the upper 
surface, is for one-fourth of its length from the roots 
of a nearly black color, then a broad line of silver- 
gray, then a narrow line of dark brown, edged with 
yellowish-white, with a few black hairs interspersed, 
giving it a brownish-gray appearance. On the 
under surface, where the hair is a little longer than 
on the back, it is black at the roots, and cinereous 
at the points ; on the forehead and nose it is slight- 
ly tinged with brown. The line of separation be- 
tween the colors of the upper and the under surface, 
exists high up along the sides, and is very distinctly 
drawn. The tail, on the upper surface, is the co- 
lor of the back ; slightly tinged with brown beneath ; 
the teeth are white. 
Length of the head and body, 8 inches 9 lines. 
“ head, 1 “ io “ 
“ “ tail, (vertebrse,) 1 “ 0 “ 
“ “ “ including fur, 1 “ 6 “ 
Length from heel to end of middle 
hind claw, 1 “ 4 “ 
This species bears some resemblance to the taw- 
ny marmot, (S. Richardsonii,) with which I have 
compared it, as also to the American souslik, (Arc- 
TOMYS. Spermophilus guttatus, Richardson,) but is 
evidently distinct from either. 
