r^^<6.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 223 



On the upper surfaces of the body the basal half of the under fur is 

 white, the distal half is dark brown. The long hairs are yellow in the 

 distal half, but some are white in the basal half, while others are brown. 

 The hairs are about lo"" long. With the under fur, they completely 

 conceal the spines, except on the neck, rump, and tail. Spines are 

 absent from the sides and are few in number and weak in the middle 

 of the back. On the rump, however, they are numerous and strong, 

 and, as already stated, are not mingled with, nor concealed by, long- 

 hair. They do not extend beyond the under fur, but are visible in it. 



ZAPODID.ZB. 



12. Zapus hudsonius Coues. Jumping Mouse. 



Two specimens. Nushagak, August 21, 1882. " Kare ; caught in a 

 cache." (McKay's note-book.) 



This rodent has been taken in somewhat higher latitudes in British 

 America, but has not, I believe, been hitherto recorded from Alaska. 



MURID^. 



13. Arvicola riparius Richardson. Meadoic Mouse. 



Seven specimens, Nos. 14099-14103, 14106, 14147. Localities not defi- 

 nitely given. 



14. Evotomys rutilus Gapperi (Vigors) Cones. Red-hacked Mouse. 

 One specimen. No. 14104. Locality not definitely given. 



15. Myodes obensis Brauts. Lemming. 



A single young specimen, in summer pelage. 



16. Cuniculus torquatus (Pallas) Coues. WIdte Lemming. 



Four specimens, in winter pelage, taken at Nushagak in the winter of 

 18S2-'83. "Not very common. Found in the tundras, &c." (McKay.) 



17. Fiber zibethicus (Liun6) Curier. Muslrat. 



Three specimens. No. 13626 taken at Nushagak, September 10, 1881 ; 

 No. 13959, at Ugashik, July, 1881. No. 14076 is a pure albino. 



CASTORIDiE. 



18. Castor fiber Linn6. Beaver. 



A young 8i)ecimen (No. 13627), taken at Kokwok, December 17, 1881. 



SCIURID^. 



19. Sciurus hudsonius Pallas. Fed Squirrel. 



Three specimens, taken in the vicinity of Lake Iliamna in the winter 

 /of 1882, belong to the subspecies hadsonius. 



