Elliot New Mammal*. 139 



would assume, would be brown also. The total absence of all white hairs 

 from the old bull is singular, as he is the only one without them. 



Seven specimens of this new subspecies are mounted and arranged in a 

 group in the west court of the Museum. 



RED PRAIRIE DOG. 



Type from White Horse Spring, Oklahoma Territory. Type No. 6863, 

 Field Columbian Museum. 



General characters. General color cinnamon rufous, altogether different 

 from that of C. ludoviciamis. Skull compared with that of above-named 

 species has a narrower palate and larger bullse ; and with arizonensis has a 

 broader braincase and wider nasals. 



Color. Head, upper parts of body and sides cinnamon rufous, darkest on 

 head and dorsal region, each hair tipped with whitish, most conspicuous 

 on sides of rump and flanks ; underparts and inner side of legs pale yel 

 lowish washed or tinged with rufous on chest and abdomen, grading on 

 sides into the color of the flanks ; upper parts of fore legs and feet pale 

 vinaceous cinnamon ; outer side of thighs pale cinnamon rufous ; feet pale 

 vinaceous buff; claws black. Tail cinnamon rufous grading to Van Dyke 

 brown at tip. 



Measurements. Total length, 385 ; tail vertebrae, 70 ; hind foot, 58. Skull : 

 total length, 63 ; Hensel, 52 ; zygomatic width, 45 ; greatest width of brain- 

 case, 25 ; length of nasals, 21 ; palatal length, 31.5; length of upper molar 

 series, 13; length of mandible, angle to top of incisors, 18 ; lower molar 

 series, 16. 



Remarks. In my paper on Oklahoma mammals collected by Mr. Surber, 

 I noticed a great difference in the color of the specimens obtained when 

 compared with those of the other known species of Cynomys, those from 

 Oklahoma being very much darker and more reddish. As all Mr. Surber's 

 examples were collected in the spring (April), I supposed the difference of 

 hue might be attributed to a seasonal variation, and called the specimens 

 ludovicianus. Having, however, obtained some C. ludovicianus taken in 

 April, I find that the same difference in color still exists and that it is not 

 caused by any seasonal change of pelage. The same striking variation in 

 the general hue is exhibited between the present species and other mem 

 bers of the genus Cynomys, as exists between Citellus 13-lineatus and C. 13-1. 

 te.rensis, with the addition of separate cranial characters. 



Mustela boria f sp. nov. 



FARTHEST NORTH MARTEN. 



Type from the Lower MacKenzie River District, toward Arctic Ocean ; 

 exact locality unknown. No. 13,484, Field Columbian Museum. 



General characters. Darkest in color of American martens ; tail long, 

 black. 



* 7ru/5p<5-Tpi%os with red hair. 



f B6/3610S adj. from the quarter of the North Wind. 



