October, 1902.] MAMMALS OF KEEWATIN. 49 



Total length 1,000; tail vertebra 380; hind foot 190. Skull: Occipito- 

 nasal length 137; zygomatic breadth 99; interorbital constriction 25; 

 length of nasals 51; breadth of nasals M; length of upper molar series 

 (crowns) 30. 



Nine adult skulls of both sexes, collected in the vicinity of Oxford 

 House, average as follows: Occipito-nasal length 131.3; zygomatic 

 breadth 93.5; interorbital constriction 25; length of nasals 47.3; 

 breadth of nasals 23.6; length of molar series (crowns) 28.2. 



Dr. Bell reports that a family of beavers was found by Indians on 

 North River, a stream that flows into the Bay about 15 miles above 

 Fort Churchill." Hearne relates that the Indians who accompanied 

 him on his first exploring trip killed beavers on Seal River, the mouth 

 of which is about 40 miles north of Fort Churchill.* The point at 

 which Hearne seems to have crossed Seal River, and presumably 

 where the beavers were taken, is not far from the Bay. 



[Mus musculus Linn. House Mouse. 



Referring to this species, Richardson says: 'T have seen a dead 

 mouse in the storehouse at York Factory."' J. E. Gray records a 

 specimen of the house mouse collected by Dr. Rae at York Factory,, 

 with the remark that it was probably introduced from Europe.'' The 

 species does not seem to have ever become established, though individ- 

 uals should apparently be landed occasional!}^ with goods from England. 



We trapped large numbers of mice about the various buildings, but 

 took only the native species.] 



Peromyscus canadensis umbrinus Miller. * Clouded White-footed 



Mouse. , 



We found this form common and apparently qu.ite generally dis- 

 tributed between Norway House and York Factory, and took speci- 

 mens at the following localities: Norway House, Sea Falls, Echimamish 

 River (Middle Dam and Painted Stone Portage), Robinson Portage. 

 Pine Lake, Oxford Lake (south end), Oxford House, Trout Falls, Hill 

 River (mouth of Fox River and near Rock Portage), Steel River,, 

 Ha3^es River, and Yoi'k Factory. 



I have compared this series with the type series of P. cii/iadensi-'< 

 uinhriniis from Peninsula Harbor, Ontario. The specimens of the 

 tj^pe series are mainly in fall pelage, while most of our Keewatin 

 specimens were taken during the sunmier; but enough are comparable 



f'Rept. Prog. Can. Geol. Surv. 1882-3-4, Apjx II, p. 49DD (1885.) 

 5 Journey from Prince of Wales Port * * * to the Xorthern Ocean, p. 9, 1795. 

 "Fauna Boreali -Americana, I, p. 141, 1829. 



s'Rae's iSTarrative of an Expedition to the Shores of the Arctic Sea, Appendix, p. 

 199, 1850. 



«Proc. Bost. Soc. Nat. Hist., 28, No. 1, p. 23, April, 1897. 



7166— No. 22 4 



