The Chipmunks of the Genua Eutamias. 



211 



series of utnhem^is in corresponding pelage from the east base of 

 the AVasatch Mountains in Utah is most striking. In typical 

 dors((lis tlie post-aiiricular spots are white and much larger and 

 more sharply defined than in utahcnsis. They are bordered below 

 by chestnut, a continuation of the lower facial stripe. All of the 

 facial stripes arc broad, sharply defined, and highly colored. 

 The under side of tlie tail is deep chestnut — in some specimens 

 bright orange-rufous — instead of fulvous, as in atahensis. The 

 upper parts also are somewhat darker. The difference between 

 summer and winter pelages seems to be much greater in dorsalis 

 than in utahensis. The two forms would undoubtedly have been 

 separated before if any recent mammalogist had seen typical 

 specimens of Ijotli ; Init until the present series was obtained 

 from the type locality the typical form was practically unknown. 

 The difference in size between the two forms is marked, dorsalis 

 being much the larger, as may be seen b}^ reference to the ac- 

 companying average measurements of specimens from the tj^pe 

 localities of both : 



Average mensnremcntit of Ea/nmias dorsnlis and E. dorsalis utnlimsis from 

 ti/pe localities {measured in flesh). 



Eutamias dorsalis idahensis was obtained by the Death Valley 

 Expedition in but a single locality, namely, the Beaverdam 

 Mountains in the extreme southwestern corner of Utah, where 

 several were seen in rocky places in the pinon belt at an altitude 

 of 1200 to 1375 meters (4000-4500 feet). They were so shy that 

 only one was secured, although Mr. Bailey and I spent several 

 hours in watching the rock heaps into which they had disap- 

 peared. 



Two years later (in 1893) I found the s))ecies in the so-called 

 ' San Francisco ' or ' Horn Silver ' INIts., between the south end 



