Mammals 45 



munks. Say's animal was discovered on the Arkansas River, 

 about 26 miles below Canon City; it is generally common along 

 the eastern foothills. 



Two subspecies have been observed in Colorado, in addition 

 to the typical form. E. q. hopiensis of Merriam, discovered in 

 the Painted Desert country of Arizona, extends into the cedar 

 and pinyon region of western Colorado. The ground color of the 

 upper parts is light bright chestnut, the dark stripes not being 

 black. It is another example of a paler form inhabiting a dry 

 region, but quite independently a different pale race, E. q. ani- 

 mosus of Warren, has developed in Las Animas and Baca Counties. 

 There is some difference of opinion as to whether animosus 

 represents a distinct local race, or merely peculiarly colored in- 

 dividuals; but its appearance is distinct, and it is the kind of 

 animal we might expect in the very dry country it inhabits. How- 

 ever, Mr. Warren writes that he has specimens from bluffs north 

 of Colorado Springs, taken in faded pelage, very like animosus. 



The Utah chipmunk, E. dorsalis utahensis of Merriam, is 

 readily separated by its grayish, washed-out appearance, the 

 dorsal stripes indistinct. It extends into northwestern Colorado, 

 having been taken in the cedar and pinon zone of Routt County. 



The above species of Eutamias are over 8.25 inches long; 

 but there is another group, that of E. minimus, in which the 

 total length ranges from 7.25 to 8.25 inches. The common 

 member of this group is E. operarius of Merriam, or the busy 

 chipmunk, formerly supposed to be a subspecies of the Oregon 

 E. amoenus. It abounds in the front range, usually at high 

 altitudes; the type specimen was taken by Vernon Bailey at 

 Gold Hill. For a long time it was confused with the species 

 described by Say, but Merriam in 1905 showed that it could be 

 separated. The other members of this group are less likely to 

 be met v/ith. The grayish E. minimus caryi of Merriam occurs 

 in Costilla and Saguache Counties; the paler bleached-looking 

 E. minimus of Bachman is found in northwestern Colorado; the 

 handsome dark E. m. consobrinus of Allen, described from near 

 Salt Lake City, is common in western Colorado. Warren records 

 that in one locality, Yarmony Creek, Eagle County, E. conso- 

 brinus, quadrivittatus, and hopiensis were all taken, though in 

 general they occupy different areas. In a few places the range 



