282 Bulletin American Museum of Natural History. [Vol. XX, 



little marshy meadows, but was also sometimes trapped in 

 timber in places like those inhabited by red-backed mice." 

 At Caribou Camp and at Moose Camp they were also found 

 in similar situations. 



12. Dicrostonyx nelsoni Merriam. NELSON'S LEMMING. 

 Three specimens, 2 adult and i young, Muller Bay, June 5, 

 7 and 12. 



" Not at all common. Their burrows were round, clean- 

 cut holes about an inch and a half in diameter, running 

 directly down into the earth for some inches. In most places 

 I saw no signs of the earth which had been removed in mak- 

 ing the burrow." M. P. A. 



13. Fiber spatulatus Osgood. NORTHWEST MUSKRAT. 

 One specimen, Seldovia, Alaska, Oct. 13. Total length, 490; 

 tail vertebrae, 215; hind foot, 70; ear, 20. The skull is so 

 badly crushed that it is not available for critical comparison 

 with allied material. 



14. Erethizon epizanthus myops Merriam. ALASKA POR- 

 CUPINE. One specimen, Seldovia, Aug. i, brought in by an 

 Indian. 



" Occasionally found in the neighborhood of Seldovia." 

 M. P. A. 



15. Lepus americanus dalli Merriam. BALL'S VARYING 

 HARE. Nine specimens, of which only i is fully adult, 6 are 

 about one fourth grown, and two are about three fourths 

 grown. The adult is from Barabori (Sept. 9) and the young 

 are all from Sheep Creek (Aug. 11-30). 



This is a very dark form of the L. americanus group, the 

 prevailing color in summer pelage of the adult and the two 

 nearly grown young being blackish, and hence very much 

 darker than L. americanus saliens in corresponding pelage; 

 but there are no very obvious cranial differences between the 

 two forms. 



Lepus americanus dalli was based on a skull from the 

 Nulato River, and the external characters of the form have 



