I2O BROOKLYN INSTITUTE MUSEUM. SCIENCE BULLETIN : I J 5. 



Represented by three specimens, taken by Mr. Engelhardt, two of 

 them August 25, in Buckskin Valley, Iron County, Utah, and the other 

 in Pine Valley, Beaver County, Utah, August i. They are all adult 

 but not old, the teeth being unworn. 



Cynomys parvidens is a form of the leucurus (=lewisii) group, 

 distinguished by its reddish instead of pale fulvous coloration and 

 small teeth. The incisors are pale yellow instead of white, as they are 

 in all of the four specimens of true leucurus available for examination. 

 The white tail tip is also longer in C. parvidens. 



7. MARMOTA ENGELHARDTI sp. nov. 



Type, No. 446, Mus. Brooklyn Inst. Arts and Sciences, Briggs Meadows (alt. 

 10,000 ft.), Beaver Range Mountains, Utah, August 20, 1904; George P. 

 Engelhardt. 



Sides of nose, chin, and anterior part of throat white; whole top of head 

 black; upper surface of body grizzled gray and dusky brown, the underfur 

 blackish slate basally and broadly tipped with cinnamon, the long hairs black, 

 broadly tipped with white ; shoulders and thighs externally like the dorsal area ; 

 eyering and large patch on sides of neck pale rusty yellow; whole ventral sur- 

 face deep chestnut, anteriorly to the base of the hairs, posteriorly the basal third 

 blackish ; inside of fore and hind limbs like the ventral surface ; upper surface 

 of hind feet deep chestnut; tail very long, the apical half black, the proximal 

 half more or less varied with gray and rusty-tipped hairs. 



The type and only specimen is immature and without flesh measurements. 

 The dimensions of the skin are: Total length, 640 mm.; head and body, 480; 

 tail vertebrae, 160; tail to end of hairs, 205; hind foot, 70. Skull (still retaining 

 the milk premolars), total length, 74; zygomatic breadth, 48.3; length of nasals, 

 29; breadth of rostrum in front, 15. 



In pattern of markings Marmota engelhardti agrees with M. flavi- 

 venter and M. dacota, but differs widely in coloration from either. 

 Compared with specimens of M. flaviveuter from Donner, California, 

 of exactly corresponding age, the dark tints are much blacker, and the 

 fulvous tints are replaced by dark ferrugineous or chestnut. The denti- 

 tion is much weaker, and the palate is more produced posteriorly, and 

 the palatal fossa is broader. 



The Marmots living in the Beaver Range are geographically widely 

 separated from any other locality inhabited by representatives of this 

 genus, and it is not strange that they should show the impress of their 

 surroundings during their long period of isolation. 



Mr. Engelhardt informs me that he found these animals living in 

 colonies among the rocks at from 9,000 to ii,ooo feet. 



