ZOOLOGY MAMMALS. 103 



NEOTOMA CINEREA. 



Rocky Mountain Rat. 



Neotoma drummondii, RICH. F. B. A. I, 1829, 137. 

 JVeotomu cinerea, BAIRD, Gen. 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. 



ARVICOLA TOWNSENDII, B a c h m a n . 



Oregon Ground Mouse. 



Jrvicola townsendii, 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. cxliv. fig. 1. 

 BAIRD, Gen. Rep. Mammals, 1857, 527. 



Sr. CH. Very large, (head and boJy 5| 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. 



ABVICOLA OREGONI, B a c h m a n . 



Arvicola oregoni, BACHMAN, J. A. N. Sc. Phila. VIII, i, 1839, 60. IB. in Townsend s Narrative, 1839, 315. 



ACD. & BACH. N. Am. Quad. Ill, 1853, 232 ; pl.cxlvii, f. 3. 

 Jlrvicola (Chilotus) oregoni, BAIRD, Gen. Rep. Mammals, 1857, 537. 



SP. CH. About the size and shape of Jlrvicola pinetorum, (3k inches.) Skull .92. Fur short, (.3 of an inch.) Head short, 

 broad. Ears moderate, barely concealed, quite naked, with a few scattered inconspicuous white hairs. Antitragus small. Tail 

 vertebra 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 bo y, but not sharply bicolored. Feet grayish brown. 



Steilacoom, W. T., 1855. 



FIBER ZIBETHICUS, Cuv. 



Mnskrat. 



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 washingtonii, 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. sylvaticus, or a little larger. Fur 

 very soft and full on the body and beneath the feet. Tail very short. Back, sides, and throat reddish brown ; the former with 

 many glossy black hairs. Tail lead color above, rusty white beneath. Abdomen pure white. Ears black on the posterior 

 margin and tip of their inner surface ; the rest of this surface pale reddish brown, except on the exterior band. 



