FAUNA AMERICANA. 179 



gray and black ; side of the head and orbits pale 

 ferruginous ; cheek, under the eye and ear, dusky. 



Dimensions. From the nose to the tip of the 

 trunk of the tail one foot seven inches and one- 

 fourth ; trunk of the tail from the base to the tip 

 nine inches one-tenth ; length of the ears three- 

 fourths of an inch ; tail more voluminous even than 

 that of the S. cinereus. 



Description. Fur on the body plumbeous, black 

 at base, then pale cinnamon, then black, then cine- 

 reus, with a long black tip ; ears bright ferruginous 

 behind, the colour the same to the base of the fur, 

 which in the winter dress is prominent beyond 

 the edge ; within dull ferruginous, the fur slightly 

 tipped with black; whiskers black in about five 

 series, of which the four inferior ones are more 

 distinct, hairs slightly flattened ; mouth margined 

 with black ; teeth reddish-yellow ; head beneath, 

 neck and feet above, pale ferruginous; belly paler; 

 fur pale plumbeous at base ; palms black ; anterior 

 toes, four; thumb tubercle not longer than its lobe 

 in the palm, and furnished with a broad, flat nail ; 

 posterior toes, five; tail beneath bright ferrugi- 

 nous, the colour extending to the base of the fur, 

 with a submarginal black line; above mixed fer- 

 ruginous and black; fur within pale cinnamon, with 

 the base and three bands black ; tip ferruginous. 



The fur of the back in the summer dress is from 

 three-fifths to seven-tenths of an inch long ; but in 

 the winter dress the longest hairs on the middle 



