220 NORTHERN ZOOLOGY. 
winter, but towards the tips it is ringed with yellowish-brown and black. On the back, the 
black is in large proportion, and the resulting colour of the surface is a dark umber-brown, 
mixed with yellowish-brown. On the head there is more brown, and it has a brighter tint. 
There is more black on the crown of the head than on the cheeks; the sides of the muzzle 
are paler, and are sprinkled with white. A white circle surrounds the eye, but the margins 
of the eyelids are black as in winter. The under jaw is smoke-gray, the throat unmixed 
yellowish-brown. The white colour commences between the fore-legs, extends over all the 
belly, and predominates on the extremities; but wherever the fur on the latter is ruffled, 
the brown colours of the roots of the fur are seen. The sides present a dull, pale, yellowish- 
brown colour, with a few scattered black hairs. The ears are nearly naked in the summer, 
but the fur generally remains on their margins of a mixed white and blackish-brown, the 
latter colour prevailing at their tips. The faz/ is white underneath ; on its upper surface the 
gray and brown colours appear through the white. Whiskers as in winter. 
DIMENSIONS 
Of full-sized individuals. 
Inches. Lines» 
Inches. Lines. 
Length of head and body : 3 18) 0 Length of middle toe and claw Fie | | 3 
5, from nose to the tip of the middle “5 the middle fore-claw alone 0 7 
claw of the hind leg, when stretched out . 27 6 Hind Extremities. 
>, Of head, measured with a line over >, from knee joint to end of middle 
the curvature of the forehead 4 3 claw C 0 c 9 6 
>, of head, measured with callipers 3 6 5, of tibia 5 c - 4 6. 
He ears, in their winter fur (posteriorly) 3 2 5, from heel to end of middle claw 5 6 
55 ears, from rictus to apex 2 9 oS heel to root of middle toe one 3 
- tail (vertebre) : J 6 5, of middle toe and claw 2 4 
5 tail, including fur . 5 6 39 middle claw t o 6h 
bp whiskers S ° 3 9 % the scull, from the insertion of the 
Fore Extremities. incisors to occipital spine (measured by 
ap ulna é slo 6 calliper compasses) . 2 9 
>> from carpal joint to point of middle 
claw é - 5 2 9 
