1903.] Allen, Mammals from Northern British Columbia. 547 



Mountains, n, July 2125; Level Mountain, 42, September 

 10 21 ; Raspberry Creek, 9, October 6-13. 



The type of Evotomys dawsoni was from the Finlayson River, 

 a northern fork of Liard River. The present series added to 

 the 1 6 specimens taken by Mr. Stone at Fort Norman, at Fort 

 Liard, at Hell Gate on the Liard River, and at other localities 

 in the same general region, forms a series of 83 specimens 

 collected at various dates from the middle of July to the 

 middle of December. There is also in the collection the series 

 of 35 specimens obtained by the Stone Expedition of 1901 on 

 the Kenai Peninsula, making about 1 20 specimens referable to 

 this species. The adults are very uniform in coloration except 

 three taken on the Liard River December 7-11, 1897,' and 

 one at Dawson ; these differ from all the others in their much 

 lighter, yellowish brown color, and represent apparently the 

 midwinter coat, which is usually lighter than that of late 

 summer and early fall. There can be little doubt that these 

 specimens are referable to the true E. dawsoni from Finlayson 

 River and Fort Liard. Yet they fall far below the average 

 size as given by Bailey (Proc. Biol. Soc. Washington, Vol. XI, 

 1897, p. 121), based on Yakutat specimens, of which he gives 

 the average of eight specimens as: "Total length, 144; tail 

 vertebrae, 33; hind foot, 20." 



The series from the upper Liard River region contains 

 many specimens with well-worn teeth and very mature-look- 

 ing skulls, yet only 5 attain a length of 140 mm., the average 

 of 20 of the largest specimens of the series falling slightly 

 below 130, with an average length of tail of about 33, but 

 with the hind foot 19 instead of 20. Thus 13 specimens (9 

 males and 4 females) from Level Mountain measure as fol- 

 lows: Total length, 129 (123141); tail vertebrae, 32.7 (29 

 38); hind foot, 18.6 (18-19.5); ear > J 5- 6 (14-16.5). The 

 largest 13 specimens from the Kenai Peninsula (6 males and 

 7 females) are somewhat larger, having a total length of 137 

 (133140); tail vertebrae, 32.6 (3138); hind foot, 19 (18 



1 Formerly (this Bulletin, Vol. XII, 199, p. 5) erroneously referred to E. alascensis, 

 as shown on reexamination, in the light of more abundant material. The supposed 

 cranial differences mentioned prove to be due to the immaturity of the single complete 

 skull available for examination. 



