344 APPENDIX F 



Sciuropterus sabrinus (Shaw). Hudson Bay Flying Squirrel. 



The flying squirrel was not observed by us during the trip, but 

 the skin of one was given us by J. McLenaghen, of Fort Resolu- 

 tion. He stated that the squirrels are occasionally taken in mar- 

 ten traps, but are rare. 



Peromyscus arcticus (Mearns). Arctic White-footed Mouse. 



This species is quite generally distributed throughout the 

 region north to Great Slave Lake, and a series of specimens was 

 collected from the following localities: Grand Rapids and Fort 

 McMurray, Athabaska River; Smith Landing, Fort Smith, 

 Fort Resolution; Kah-d'nouay, Ootsingreeay, and Caribou 

 Islands in Great Slave Lake; and Fort Reliance. 



Specimens were taken at Fort Smith, between June 13 and 

 July 1, comprising 5 adult females, containing embryos as 

 follows: 77754. 



Evotomys gapperi athabascce Preble. Athabaska Red-backed 



Mouse. 



This species, described from specimens taken at Fort Smith, 

 is common north to Great Slave Lake. We collected specimens at 

 Grand Rapids, Fort McMurray, Fort Smith, Kah-d'nouay Island 

 (a female, containing eight small embryos, July 19), and Caribou 

 Island. The last two localities represent extensions of the range 

 of the animal, which were unrecorded previously to the eastward 

 of Fort Resolution. 



Evotomys dawsoni Merriam. Dawson Red-backed Mouse. 



This species replaces the Athabaska red-backed mouse, ac- 

 cording to our observations, from the eastern extremity of Great 

 Slave Lake, north at least to the northern shore of Aylmer Lake. 

 Specimens were taken at the following points: Fort Reliance, 

 Burr Lake on Pike's Portage, Artillery Lake at the tree limit, and 

 at its head, head of Casba Lake, near the south end of Clinton- 

 Golden Lake, outlet of Aylmer Lake, western end of Aylmer 

 Lake, north shore of Aylmer Lake, and at Sandhill Bay. 



