RODENTIA-SCIURINAE-ARCTOMYS FLAVIVENTER. 
343 
List of specimens. 
Catalogue number. 
Corresponding no. 
of skull. 
'T3 
g 
Locality. 
When 
collected. 
Whence ob¬ 
tained. 
Nature of speci¬ 
men. 
Measurements. 
1 Nose to eye. 
Nose to ear. 
1 Nose to occi¬ 
put. 
Nose to tail. 
Tail to end of 
verteb. 
| Tail to end of 
| hairs. 
If 
\i 
S 
W) 
d 
S' 
Skull, length 1 
of. 
*3 
72 
Width ofmuz-| 
zle. 
Height of ear.| 
1631 
Middleboro’, Mass 
J. W. P. Jenks... 
Skin. 
1571 
2401 
Essex co., N. Y.... 
Dr. S. E. Hale ... 
3.46 
2.33 
1572 
2402 
.do. 
1573 
2403 
1574 
2404 
■■"i 
3.47 
2.46 
.81 
1575 
2405 
3064 
...do. 
Skull. 
3 S3 
9 4fi 
.80 
3065 
.... 
a nab ai 
.85 
847 
1905 
1 
.do. 
Aug. 25,1855 
S. F. Baird. 
Skin 1 . 
1.67 
3.00 
3.60 
14.50 
4.75 
6.75 
2.33 
3.04 3.19 
2.19 
.64 
1.09 
854 
1910 
c? 
.do. 
Sept. 7,1855 
....do . 
...do2. 
1.50 
2.10 
3.50 
14.00 
5.08 
7.08 
2.42 
3,14 3.27i 
2.00 
.60 
1.13 
604 
(Jarlislft, Pa.. T _- 
Skull. 
.60 
1150 
2038 
Raeinfij Wis T ., T 
1855 
A. C. Rarrv. 
In alcohol...... 
.78 
1392 
West Northfield, Ill. 
R. Kennicott. 
Skin.. 
.J 
347 
1261 
June, 1854... 
Dr. P. R. Hoy.... 
Mounted »,,., 
d. 10 
2 61 
82 
788 
Carlisle, Pa , „ -... 
S. F. Baird. 
Skull. 
.... 
3.78 
2.40 
.79 
807 
.do.. 
1679 
o 
Racine, Wis.. 
P. R. Hoy. 
2.06 
2008 
....do . 
3.60 
.79 
* To end of outstretched hind legs, 20 inches. * To end of outstretched hind legs, 18 inches j longest fore claw, .60 ; hind claw, .42. 
ARCTOMYS FLAVIVENTER, Bachman. 
Yellow-Footed Marmot. 
Jlrctomysflaviventer, Aud. & Bach. Pr. A. N. Sc. Phila. I, 1841.— Ib. J. A. N. Sc. Pliila. VIII, ri, 1842, 309.— Ib. 
N. Am. Quad. Ill, 1853, 160; pi. cxxxiv. . 
Wagner, in Wiegmann’s Archiv, 1843, II, 45. 
Sp. Ch. —Size of common woodchuck. Above, yellowish brown, somewhat grizzled with gray. Under parts of body and 
tail, and the legs all round, inside and out, reddish chestnut. 
A skin from the Black Hills, obtained by Dr. Hayden, is of very large size, The under parts, 
with the legs all round, are uniform chestnut brown, or dark chestnut, to the roots of the hairs. 
The upper parts are rusty yellowish, except in the middle portion of the lumbar region, where 
they are paler, and grizzled somewhat with dark brown, owing to a suhterminal annulation of 
this color near the tips of the long hairs. The top of the head is uniform dark brown, nearly 
black ; the top and sides of the muzzle are reddish ; the under part of the chin whitish. The 
tail is colored much like the belly; the hairs becoming dark brownish towards the roots. 
Length of skin, stretched, 22 inches ; tail vertebras, 8 ; with the hairs, 10. 
The feet are wanting in part, or else so much mutilated as not to admit of a satisfactory 
‘description. The skull of this animal has fortunately been preserved in good condition, and 
presents some very characteristic features, as compared with that of A. monax. The muzzle is 
remarkably short and broad, owing to the extent to which the intermaxillaries enter into its 
upper surface. This is connected with a much greater proportional size of the upper incisors, 
which require more space for their accommodation. There is a more than usual depression or 
concavity on the frontal hone between the orbits. The upper molars again are rather smaller 
