ocT.,iyuo.] MAMMALS OF THE YUKON KEGION. 45 



Sorex obscurus Merriam. Mountain Shrew. 



Two specimens were caught under tufts of o-mss on a rocky hillside 

 at Bciniett. This locality is nuich farther north than any from which 

 this species has been previously recorded. 



Sorex tundrensis Merriam. Tundra Shrew. 



Sort'x iandrensis Merriam. Proc. Wash. Acad. Sci., II, 16-17, March 14, 1900. 



Eighteen specimens of this pretty shrew were taken at St. Michael. 

 They were found in various parts of the tundra, but seemed to })c in 

 small localized colonies. About certain small ponds nearly all the 

 shrews caught were of this species, while lait a short distance away all 

 were arctiom. A single imperfect specimen collected by Kennicott 

 near Fort Yukon is in the National Museum. In size it does not differ 

 from typical tioidrensils, but in color it is somewhat darker, thus 

 indicating a possible intergradation with rlchardsoni. 



Myotis lucifugus (Le Conte). Little Brown Bat. 



Bats were tirst seen at Caribou Crossing, and from that point were 

 occasionally noticed at various places to our camp, 50 miles below 

 Fort Selkirk, where they were last seen. Turner mentions their 

 reported occurrence as far down as Fort Yukon and Nulato. In June 

 and July we generally found them flying from 10 to 11.30 p. m.. and 

 sometimes even later. Two specimens only were secured. These are 

 somewhat grayer and less glossy than specimens from the eastern 

 United States. 



