3 008.] MAMMALS. 187 



Quito or Calling River; and 5 and 30 miles above Athabaska Landing. 

 They noted embryos as follows: Hay River, June 30, nine embryos; 

 Cascade Rapid, August 15, four embryos. 



During my trip northward from Fort Rae I found this vole fairly 

 common along Grandin River and about some small ponds near the 

 shores of MacTavish Bay, Great Bear Lake. At my camp near Leith 

 Point, early in September, I took a small series among dwarfed 

 birches and willows bordering a tiny stream. I secured a good series 

 also at Fort Franklin, mainly along a small stream on a partially 

 cleared hillside. At Fort Simpson, where I took a large number 

 during the autumn of 1903 and the following winter and spring, it 

 is common and enters the buildings freely. While descending the 

 Mackenzie in June. 1904, I found it only fairly common at Fort Nor- 

 man and Fort Good Hope, and collected a few at each place, but 

 failed to secure it below the latter point. 



The large series taken is plainly referable to M. drummondi, al- 

 though the more northern specimens are considerably larger than 

 typical examples of this species from the Jasper House region." The 

 Fort Rae specimens are especially large, and show an approach in 

 characters toward M. aphorodemus, described from the Barren 

 Grounds north of Fort Churchill.'' The heavy, widely spreading 

 zygomata of aphorodemus, however, do not appear in the Foil Rae 

 skulls, although some of the larger specimens are nearly or quite as 

 huge as that species. It is highly probable that to the northeast- 

 ward of Fort Rae J/, drurwmondi merges into aphorodemus. 



Five adults of both sexes from Fort Chipewyan average: Total 

 length 151.4, tail vertebra' 41.4, hind foot 19; ten from Slave River, 

 25 miles below the Peace, average 168.4, 49.1, 19.3; ten from Fort 

 Smith. 162.2, 42.8, 18.6; five from Fort Resolution, 160.8, 42.8, 19.6; 

 ten from Fort Rae, 169.5, 44.6, 19.3; ten from Fort Simpson, 158, 45.4, 

 19.6; three from Fort Good Hope. 1C0. 43.3, 19.6. 



During his several trips in Alberta, J. Alden Loring found this 

 species common in most localities and took specimens at Edmonton; 

 St. Albert; 15 miles south of Henry House: Smoky Valley, 50 miles 

 north of Jasper House; Fishing Lake, 90 miles north of Jasper 

 House; and Muskeg Creek, a tributary of Smoky River. At Edmon- 

 ton, where he collected in September, 1894, he found the animals 

 very abundant in the oat fields, where they were domiciled beneath 

 the shocks of grain, and were destroying large quantities of it. Speci- 

 mens from the localities just mentioned, as well as others from Lesser 



Slave Lake; Big Island: Fort Rae; Fort Simpson; Fort Good Hope; 

 _ 



"Concerning the larger size of northern specimens of 1/. drummondi, see 

 Bailey, X. A. Fauna, No. 17. p. 23, 1900. 



'' N. A. Fauna, No. 22, ]>. 52, Oct. 31, 1902. 



