Swarth — The Lemming of Nunivak Island, Alaska. 103 



I am indebted to the authorities of the Bureau of Biological Survey, 

 United States Department of Agriculture, for the loan of series of Lemmus 

 alascensis and Lemmus yukonensis. 



REFERENCES. 



True, F. W. Diagnoses of new North American mammals, April 26, 1894. 

 (Advance reprint from Proc. U. S. Nat. Mus., vol. 17, pp. 241-243, Nov. 

 15, 1894.) 



Description of Myodes nigripes, p. 242. 



Mereiam, C. Hakt. Papers from the Harriman Alaska expedition. 1. 

 Descriptions of twenty-six new mammals from Alaska and British North 

 America. Proc. Wash. Acad. Sci., vol. II, March 14, 1900, pp. 13-30. 

 Descriptions of Lemmus alascensis, p. 26, and Lemmus yukonensis, 

 p. 27. 



Osgood, Wilfred H. A biological reconnaissance of the base of the 

 Alaska peninsula. North American Fauna, no. 24, 1904, pp. 1-86, pis. 

 I-VII. 



Description of Lemmus minuscvhis, p. 36. 



Stone Wither. Report on the birds and mammals collected by the 

 McRhenny expedition to Pt. Barrow, Alaska. Proc. Acad. Nat. Sci. 

 Phila., 1900, pp. 4r-49. 



A discussion of the lemmings of the northwest occupies pages 35-42. 



