72 NEW SPECIES OF AMERICAN QUADRUPEDS. 
acute, and dark brown. There is, as in all the 
species of this genus, a minute, blunt nail on the 
thumb. The feet and legs rather long in proportion 
to the size of the animal. 
The fur is soft to the touch, fine and silky. The 
teeth, which are not robust, are yellow. A white 
streak runs from above and behind the eye to 
the nostrils, giving the nose a sharp and pointed 
appearance. This white line is marked on the 
upper surface with an edge of brown ; a minute 
line of rufous runs from the nose through the eye, 
terminating at the ear, another, commencing under 
the eye, and running parallel with the last, termi- 
nates on the neck ; a line of black, commencing on 
the forehead, extends over the back, and terminates 
at the tail; this is succeeded on each side by a 
broad line of whitish ash, then by a narrower line 
of brown commencing back of the neck, and run- 
ning parallel with the rest, till it is narrowed to a 
point on the hips ; this is succeeded by a line of 
pure white on each side, similar to the last, and, 
finally, by a broader and shorter stripe of brown ; 
giving it on the back one stripe of black, two of light 
ash, and four of light brown. The head is cinerous; 
the ears have a white spot on their posterior surface, 
similar to the last species, and also to another de- 
scribed by Say, as the Sciurus quadrivitatus, with 
which I have compared it. The neck, and whole 
of the under surface, including the legs and thighs, 
are white. The tail, which is quite narrow, is dark 
brown above, edged with light rufous. Beneath, it 
is rufous near the roots, then a line of black, edged 
