1903.] Allen, Mammals from Northern British Cohimbia. 537 



its range may extend northwestward to Lake Bennett, the 

 type locality of plesius Osgood. Several topotypes of plesius 

 (Lake Bennett, June 18-22) are intermediate in coloration be- 

 tween faded July specimens (July 31) and dark September 

 specimens in fresh pelage from Shesley River, as would be ex- 

 pected from the dates of collecting. 



Citellus columbianus seems to be specifically distinct from 

 the more northern and very much larger spermophiles con- 

 stituting the C. parryi group, differing greatly in general 

 coloration, especially in the central area of the underside of 

 the tail being gray instead of uniform reddish brown ; also in 

 relatively longer tail, much smaller size (fully one-third less), 

 and in the narrower and slenderer skull, etc. 1 



10. Citellus stonei, sp. nov. WRANGEL GROUND SQUIRREL. 



Type, No. 20775, adult (6 ?), Wrangel, Alaska, June, 1902; col- 

 lected by Andrew J. Stone, for whom the species is named. 



The type and only specimen of this species is a flat skin 

 (without flesh measurements) with an excellent adult skull, 

 and is apparently a male, and in excellent pelage. 



Above gray, suffused with rufous, especially on the median dorsal 

 area, the rufous increasing in intensity on the lower back and rump, 

 where it almost becomes the prevailing tint; the hairs individually 

 are blackish basally, then broadly banded with bright buff (almost 

 golden apically), then narrow-banded with dark brown tinged with 

 rusty, and broadly tipped with whitish, more or less suffused with 

 rufous over the median and posterior portions of the dorsal area; 

 with these hairs, constituting the bulk of the pelage, are much longer 



1 A comparison of a series of five specimens of C. columbianus from Moscow, Idaho 

 (hence topotypes), with six specimens from Banff, Alberta, shows that the latter differ 

 from the former in' certain features of the skull, although the two series are closely 

 similar in size, proportions, and coloration, except that the Banff specimens are a little 

 paler. The skull in the Banff specimens, while but slightly larger in linear dimensions, 

 is much heavier and more massive, with the zygomata especially thickened, the malar 

 being nearly twice as massive as in true columbianus, while the antorbital foramen is 

 sharply triangular instead of circular, with the peg-like process forming its lower border 

 much more heavily developed and angular, and the postpalatal border is more pro- 

 duced posteriorly. For this form I propose the name 



Citellus columbianus albertae, subsp. nov. 



Type, No. 15539, Am. Mus., $ ad., Canadian National Park, Alberta, Canada, Au- 

 gust 1 6, 1899; coll. G. F. Dippie. 



Collector's measurements of type: Total length, 321 ; tail vertebrae, 1 08; hind foot, 

 57 mm. Three other specimens in the series slightly exceed these dimensions. Skull, 

 total length, 52; zygomatic breadth, 33. 



