ZOOLOGY MAMMALS. 
103 
NEOTOMA CINEREA. 
Rocky Mouutaiii Rat. 
J^'eotoma drummondii, Rich. F. B. A. I, 1829, 137. 
Motoma cinerea, Baird, Gun. Rep. Mammals, 1857, 499. 
Sp. Ch. — Size of Norway rat. Fur very soft. Tail densely hairy ; the vertebra shorter than the body, exclusive of head. 
Above, light yellowish brown, deeper on the sides. Beneath, with feet, snowy white. 
Milk river, Nebraska. 
ABVICOLA TOWNSENDII, B a c li m a n . 
Oregon Ground Mouse. 
Arvicola toivnsendii, Bachman, J. A. N. Sc. Phila. VIII, i, 1839, 60. — Ib. In Townsend's Narrative, 1830, 315. 
AuD. & Bach. N. Am. Quad. Ill, 1853, 209 ; pi. cxiiv. fig. 1. 
Baird, Gen. Rep. Mammals, 1857, 527. 
Sp. Cii. — Very large, (head and boJy 5i inches.) Ears large; two-thirds as long as hind foot; well furred. Tail, in- 
cluding the hairs, rather less than half the head and body ; tail vertebrae twice the length of hind foot. Thumb claw 
conspicuous. Toes long ; one-third the whole foot. Fur measuring a little over one-third of an inch, with a slight gloss. 
Above, dark fuscous brown, with but little yellowish brown visible. Sides paler; beneath, ashy white. Tail almost 
uniformly brown throughout. Feet liver brown. Skull, 1.27 -\- 71, or as 100 : 56. 
Puget's Sound, W. T., 1856. 
The field mice of Washington Territory, with other vermin, are exceedingly destructive in 
the gardens. It is scarcely possible to raise either melons, cucumbers, pumpkins, or squash, 
owing to the depredations of these little animals. Seed after seed is planted, and as 
regularly dug up and eaten by them in a few days, scarcely one in many sowings being allowed 
to grow. 
AR VICOL A OREGONI, Bachman. 
Jlrv'icola oregoni, Bachman, J. A. N. Sc. Phila. VIII, i, 1839, 60. — Ib. in Townsend's Narrative, 1839, 315. 
AuD. & Bach. N. Am. Quad. Ill, 1853, 232 ; pl.cxlvii, f 3. 
Arvicola {Chilotus) oregoni, Baird, Gen. Rep. Mammals, 1857, 537. 
Sp. Ch. — About the size and shape of Jlrvicola pinetoruin, (_3| inches.) Skull .92. Fur short, (.3 of an inch.) Head short, 
br(]ad. Ears moderate, barely concealed, quite naked, with a few scattered inconspicuous white hairs. Antitragus small. Tail 
vertebrce not one-third the head and body, longer than the head, one and one-half times the hind feet. Soles hairy for posterior 
third, (.65 long). 
Above, dark brown, without any rufous tint. Hairs with obscure tips of yellowish brown. Beneath, lustrous hoary plumbeous 
ash. Tail corresponding in color to the body, but not sharply bicolored. Feet grayish brown. 
Steilacoom, W. T., 1855. 
FIBER ZIBETHICUS, Cuv. 
Muskrat. ' ■ ^ 
Baird, Gen. Rep. Mammals, 1857, 561. 
Two specimens of the well known muskrat were collected at Steilacoom, (5, 117.) No. 5, 
killed January 28. 
LEPUS WASHINGTONII, Baird. 
Red Hare. 
Lepus washmglonu, Baird, Pr. A. N. Sc. Phil. VII, April, 1855, 333. — Ib. Gen. Rep. Mammals, 1857, 583. 
Ears shorter than the head ; hind feet much longer than the head. Size about that of L. sylvalicus, or a little larger. Fui 
very soft and full on the body and beneath the feet. Tail very short. Back, sides, and throat reddish brown ; tlie former with 
many glossy black hairs. Tail lead color above, rusty white beneath. Abdomen pure white. Ears black on the posterioi 
margin and tip of their inner surface ; the rest of this surface pale reddish brown, except on the exterior band. 
