258 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY——GENERAL REPORT. 
legs, the sides of the head, the anterior portion of the ears, the anterior and posterior edges of 
the fore limbs externally, a narrow line across the flanks, and the exterior surface of the hind 
feet extending a short distance up on the leg, are of a yellowish brown; the fore feet are 
grayish; the whole under parts are clear white tinged with ashy posteriorly, the hairs being 
uniform white to their bases. Above, the hairs are dark lead color at base, then light brownish 
yellow, then black and tipped with ashy white, except where the yellowish brown markings are 
seen, when this color forms the tip. 
The tail is rather flat and distichous, not bushy ; viewed from below, the hairs extended, the 
ground color is brownish yellow, with three narrow and well defined lines of black on each 
side, margined for rather more than one-fourth, with white. The inner black line is some 
distance from the central line of the tail. The upper part of the tail has the hairs as on the 
sides, with perhaps fewer a'nnulations, and a few interspersed which are black except at tip ; 
the prevailing tint above is a mixed heavy black and yellowish brown. 
Another specimen agrees in every respect, except that the ground color of the tail is darker. 
Measurements. 
Washington, D. C. 
Washington, 
Nov. 16, 1854, fresh. 
Inches. 
Lines. 
Inches. 
Lines. 
Nose to occiput_..__ 
2 
7 
2 
6 
to eye ......______... 
1 
2 
to ear_______ 
2 
2 
to root of tail___...._____ 
10 
3 
9 
to end of outstretched hind legs_ 
16 
1 
Tail from root to end of vertebrEe ......._ 
7 
6 
8 
6 
from root to end of hairs _ -_ _ 
10 
6 
11 
4 
greatest width___ 
4 
Ears, height posteriorly ___._...._ 
1 
2 
height anteriorly__ _ _ ____ 
1 
1 
internally above skull__ ___ 
1 
2 
above the head__ _ ___ 
9 
greatest height externally from bottom of lowest notch___ 
1 
2 
8 
Arm, between claws, across shoulder--- 
12 
length of forearm__ . 
2 
1 
from elbow to end of claws_... 
3 
5 
hand from wrist......._______ 
1 
8 
fore foot to end of claws 
1 
8 
longest claw_____ 
4 
Leg, from knee joint to end of claws_ 
6 
2 
tibia 
3 
2 
hindfoot from heel to end of claws_____..._ 
2 
5 
2 
6 
longest, el aw___ 
4 
Longest toe from base_ 
10 
Width of head between zygomata_ _ 
1 
4 
In the preceding portion of this article I have described, at considerable length, fresh speci¬ 
mens of the common gray squirrel of the United States. As is well known, Dr. Bachman has 
