330 APPENDIX. 



lines in length, whilst that of the former is only nine ; thus the 

 smallest animal has the largest flying membrane. The fur of 

 P. sabrimis is much the longest. The fur on the belly of the 

 latter is white, whilst that of oregonensis has an ochreous tinge. 

 The hairs on the tail of P. sabrimis are only slightly tinged with 

 lead color at the roots, whilst in oregonensis it extends to half 

 the length of the hairs. The greater length and less breadth, 

 however, of the ear of the latter, is a sufficient mark of distinc- 

 tion. 



From our little Pteromys volucella, the difference is so great, 

 that it is unnecessary to institute a particular comparison. Be- 

 sides being much larger than our little species, and not possess- 

 ing the beautiful downy-white on the belly, the two spe- 

 cies may be instantly detected, in the volucella having its hairs 

 white to the roots, which is not the case in the other species. 



Dimensions. 

 Length from point of nose to root of tail, 



" tail to point of fur, 

 Height of ear posteriorly, 

 Breadth between the outer edges of the flying 



membrane, ..... 



Longest hind toe, including nail, . 

 Longest fore toe, including nail. 

 From heel to point of nail, 



" nose to ear, ..... 



This species inhabits the pine woods of the Cohu-nbia, near 

 the sea ; very rare. Habits of the P. volucella. — Towns, in lit. 



Townsend's Gopuer. 



Geomys *Tovmsendii, {Ricliardsoii' s manuscripts,) Journal 

 Acad. Nat. Sciences, Vol. 8, Part I. 



General color very pale gray above, with a faint yellowish 

 wash ; muzzle dusky-gray ; under parts grayish-white ; chin 

 pure white. Tail and feet white ; the former grayish above. Hairs 

 of the back very pale gray at the base, pale yellow at the apex, 

 the extreme tip cinereous. Teeth yellowish-white. Upper inci- 

 sors with a faint groove near the internal margin. Claws and 

 fore feet moderate, white. 



