6 Warren — Notes on Distribvtion of some Colorado Mammals. 



were also taken about Buffalo Pass, ]S miles south of Mt. Zirkel, at be- 

 tween 10,000 and 10,500 feet. From the relative situations of the four 

 localities just named it would seem probable that the species would event- 

 ually be taken all along the Continental Divide and the Park Range in 

 Grand, Routt, and Jackson Counties. At both .Mt. Zirkel and Buffalo 

 Pass the species was quite common ; at our camp on Mt. Zirkel as com- 

 mon as E. consobrinus, and much tamer, while at Buffalo Pass it did not 

 appear to be as numerous as the other species, and curiously enough not 

 so familiar. I discovered this in baiting them at both places for photo- 

 graphing. 



Another interesting Colorado record of this chipmunk is a specimen I 

 took on the south slope of Crested Butte Mountain, Gunnison County, at 

 9500 feet, October 8, 1910. It was the first of the species I have everseen 

 in that region. I do not know if it has any bearing on the matter, but 

 the animal was killed near the only yellow pines I know of on that moun- 

 tain, and they would hardly be growing there at such an altitude if it was 

 not a warm southern exposure,' though as noted above, this chipmunk 

 ranges to a considerably higher altitude. 



Of five chipmunks taken at Pagosa Springs, Archuleta County, in the 

 fall of 1911, two were guadrivittatus and three operarius. 



Eutamias amoenus operarius Merriam. 



This species was taken at Chambers Lake, Larimer County, at an alti- 

 tude of 9100 feet. Of four chipmunks taken at this locality June 19-21, 

 1911, two were the present species, and two E. m. consobrinus. It is 

 extremely interesting to find this overlapping of the ranges of these two 

 species, though it has been previously recorded by Gary,* who found them 

 together at Canadian Creek, at the west base of the Medicine Bow Range, 

 in the North Park, and also at Coulter, Grand County. 



May 22, 1911, I took a specimen of this species at Elbert, a town on the 

 Arkansas-Platte Divide, and well out toward the eastern end of the heavier 

 timber growth. The only other record I have of chipmunks from the 

 Divide is from Palmer Lake, at the east base of the foothills, where both 

 E. operarius and E. guadrivittatus were taken by R. B. Rockwell. Both 

 should beat Elbert. I saw other chipmunks there besides the one col- 

 lected, but was unable to secure more. 



As noted under E. guadrivittatus, the present species was taken at 

 Pagosa Springs, Archuleta County, October, 191], among the yellow pines. 

 It does not appear to be definitely recorded from that locality. 



Eutamias minimus consobrinus (Allen). 



As just stated under the preceding species, this chipmunk was taken at 

 Chambers Lake, Larimer County. Two were also taken on the North 

 Park or Jackson County side of the Medicine Bows, a few miles below 

 Cameron Pass, at an altitude of 9500 feet, and approximately opposite 



* Some Unrecorded Colorado Mammals. Proc. Biol. soc. Washington, XX, pp. 24- 



•25, 1907. 



