398 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
comparison with that of the body. The cheek pouches are unusually small, which may, how¬ 
ever, he owing in some measure to contraction in alcohol. The specimen was received whole in 
spirits, with the pouches everted. 
The head is broad and large ; the whiskers very short and grayish white ; the ear margin 
quite distinct; the tail, nearly half the length of the body, everywhere completely covered with 
hair, except at the extreme and blunt point. The fur is rather soft, and full everywhere. The 
cheek pouches are small ; densely coated everywhere with short, close, velvety hair. 
As remarked above, the feet are unusually powerful, the claws particularly so ; on the hands 
these are much curved, compressed and high, though not very long ; the general proportions 
are not dissimilar to the Steilacoom species, though here the feet are actually larger ; the middle 
claw, measured below, occupies about one-third the length of the whole hand, (with the claw,) 
or is nearly half the length of the palm and fingers ; its finger, again, is nearly of this same 
length, and slightly shorter than the palm proper. The thumb is very small, reaching barely 
over two-fifths of the whole hand. The second finger is longer than the fourth ; the fifth claw 
does not quite extend to the end of the bulb of the fourth finger. The hind feet are very broad, 
the first and second claws reaching-further, respectively, than the fifth and fourth. 
The incisors are yellow, nearly flat in front, or with hut slight convexity in the cross sections. 
There is a distinct raised margin to the inner edge of the upper ones, though scarcely an incised 
furrow ; they are also large in proportion to the rest of the skull. 
The entire upper parts are of a pale grayish yellow brown, with a gloss of darker along the 
middle of the hack, the tips of the hairs scarcely darker. The under parts generally, the entire 
fore legs, the hind feet, tail, and inside of the cheek pouches, are yellowish white with a faint 
tinge of reddish, particularly on the edge of the belly and outside of the fore legs. The base 
of the tail above has a slight point running on it like the hack. There is a dusky spot around 
and behind the ear. 
The specimen of this species described above was collected somewhere in the vicinity of Fort 
Pierre, Nebraska, in the summer of 1853, by Dr. John Evans, and preserved in alcohol. The 
measurements of body, head, and tail, were taken before skinning. * 
Measurements of 610. 
Inches. 
Lines. 
Nope to occiput _ _............_ 
1 
6 
to root of tail- __ _----- 
4 
6 
Tail from root to end of vertebral _____---------------- 
2 
1 
2 
n 
8 
upr.oyp.red portion ___ _----- 
1 
Ears height internally - ! above skull _ __ 
1 
Arm, fore foot to end of claws___......___ 
10 
4£ 
longest claw, (above)- -- -- -.-...l--........__ 
4 
and finger -_------------------------ 
6 * 
1 
Leg hind foot from heel to end of claws__ 
1 
longest claw ____ 
2 
Skull length .. . __- 
1 
4 
