530 bulletin: museum of comparative zoology. 



Rae from the west side of Hudson Bay. At all events, his figure 

 shows the even ruddy tint of richardsoni. Dr. Merriam, in 1900, 

 first recognized the form as distinct, but as his type was In white 

 pelage, he was able to point out certain cranial differences only, in 

 comparison with other American specimens. Preble, in 1902, ampli- 

 fied his descriptions and gave some account of the habits. By more 

 recent writers this has been grouped with hudsonius as a subspe- 

 cies, but a study of the series now available proves its relationship 

 rather with the Alaskan rubricatus, as originally pointed out by Dr. 

 Merriam. 



S-pecimens examined. — In all 112, from the following localities: — 



Ft. Churchill (type-locality), 34 (U. S. Biol. Surv.); 1 (U. S. N. M.). 



Cape Churchill, 15 (U. S. Biol. Surv.). 



50 miles south of Cape Eskimo, 10 (U. S. Biol. Surv.). 



25 miles south of Cape Eskimo, 5 (U. S. Biol. Surv.). 



Chesterfield Inlet, 2 (A. M. N. H.). 



Baker Lake, 1 (A. M. N. H.). 



Cape Fullerton, 4 (A. M. N. H.). 



Wager River, 1 (A. M. N. H.). 



Repulse Bay, 3 (A. M. N. H.). 



Southampton Island, 2 (A. M. N. H.). 



Frozen Stream, 1 (A. M. N. H.). 



Cape Sheridan, 12 (A. M. N. H.). 



Winter Island, 1 (A. M. N. H.). 



Whale Point, 2 (A. M. N. H.). 



Northwest coast of Hudson Bay, 13 (A. M. N. H.). 



Artillery Lake, 2 (A. M. N. H.). ' 



Aylmer Lake, 2 (A. M. N. H.); 1 (U. S. Biol. Surv.). 



DicROSTONYX RUBRICATUS uNALASCENSis Merriam. 

 Unalaska Collared Lemming. 



Dicrostonyx unalascensis Merriam, Proc. Washington acad. sci., 14 March, 



1900, 2, p. 25. 

 Dicrostomjx hudsonius unalascensis Elliot, Field Columbian mus. publ. 



Zool. ser., 1901, 2, p. 210. 



Type. — A skull lacking the occipital portion, U. S. Biological 

 Survey 99,622 U. S. N. M., Unalaska Island, Alaska, 8 July, 1899. C. 

 Hart Merriam. Found in owl pellet. 



