134 



THE MUSEUM. 



but the median dorsal band much 

 brighter yellowish rufous, nearly as in 

 5. f. niogollonensis, but size much 

 smaller than the latter Summer pel- 

 age. The summer pelage is not re- 

 presented in the present material, but 

 is probably very nearly like that of 5. 

 /. mogolloncnsis. The geographic 

 range is Taos Range Mountains, New 

 Mexico. In coloration S. /. neomcx- 

 icaniis very closely resembles S. /. 

 niogollonensis, in this respect being 

 much nearer that form than to 5. fre- 

 nionti. It is, however, essentially of the 

 same size as S. freinonti, and thus 

 much smaller than S. h. mogollonen- 

 sis, with relatively much shorter nas- 

 als. 



Sciiirus freinonti niogollonensis , 

 (Mearns) Arizona Chickaree. Win- 

 ter pelage similar to 5. fremonti, ex- 

 cept that the median dorsal band is of 

 a brighter, stronger tint of yellowish 

 rufous. Tail and lower parts similar. 

 Summer pelage similar in all respects 

 to S. fremonti except that the rufous 

 suffusion of the upper parts is much 

 brighter and stronger. The geograph- 

 ic range is the higher mountains and 

 plateaus of Central Arizona, from the 

 Douglas fir belt to the timber line. 



Sciurus freinonti grahantensis 

 (Allen) Mount Graham Chickaree. 

 Summer pelage differing from that of 

 S^ f. niogollonensis in being yellower 

 and less rufescent above, with the 

 central area of the tail ochraceous 

 above and nearly white below. The 

 winter pelage is not represented. 

 Geographic range is the fir zone on 

 the summit of Mt. Graham, Arizona. 

 5. freinonti grahamensis is very close- 

 ly related to S. j. niogollonensis, from 

 which, however, it seems to be easily 

 separable, as stated above, so far at 

 least as present material is concerned. 

 The two forms, nnreover, are geo- 

 graphically well isolated. 



Review of the Sciurus fremonti 



GROUP. 



The Sciurus fremonti group is 

 sharply differentiated from the .S' hnd- 



sonicus group, although separated at 

 several points by only a slight geo- 

 graphical interval. .S' freinonti prop- 

 er is found apparently throughout the 

 mountains of Colorado, ranging north- 

 ward to the northern extremity of the 

 Medicine Bow Range, which extends 

 a few miles over the Wyoming bor- 

 der. In the Laramie Mountains, the 

 next range to the northeastward, and 

 only a few miles distant, is found the 

 entirely distinct and very different 5. 

 //. baileyi. The Chickaree found at 

 Wood's P. O. in the Medicine Bow 

 Mountains is true 5. fremonti, while 

 the Chickaree from the southern end 

 of the Laramie Mountains, less than 

 thirty miles to the eastward, is a pale 

 phase of i'. Ii. baileyi. 



Typical S. freinonti is represented 

 in the present material by specimens 

 from several points in the Uintah 

 Mountains, including the vicinity of 

 Fort Bridger, Wyoming, while from 

 the Bear River and Wasatch Moun- 

 tains, only thirty to fifty miles to the 

 westward of points where 5. freinonti 

 occurs, 5. Ii. vcntornin is the only 

 Chickaree represented in the material 

 now in hand. In neither case is there 

 apparent any evidence of intergrada- 

 tjon. 



In southern Colorado true 5. fre- 

 monti grades toward what is here call- 

 ed .S. f. neomcxicanus, a phase which 

 in coloration is hardly separable from 

 i. niogollonensis. At present our 

 knowledge of the distribution of the 

 Chickarees in Colorado and New Mex- 

 ico is very limited. A single winter 

 specimen from Chama, New Mexico, 

 almost on the Colorado boundary, 

 seems referable to true freinonti, but 

 all the specimens from the eastern 

 slope of the Taos Mountains in Col- 

 fax and Mora counties, New Mexico, 

 are very different from specimens 

 from central and northern Colorado. 



5. f. niogollonensis differs from 5, 

 fremonti in its much brighter and 

 more yellowish dorsal region in both 

 pelages, and also in its larger size, es- 

 pecially as shown by the skull meas- 



