1 90 1.] Allen, A New Caribou from Alaska 145 

 COMPARATIVE MEASUREMENTS OF SKULL. 



R. mon- R. grcen- 



R. stonei. tanus. landicus. 



$ ad. $ ad. $ ad. 



Basal length 410 420 375 



Tip of premaxilla to tip of nasal 125 125 115 



" alveolus of p 1 146 148 121 



Length of nasals 116 123 in 



Breadth above m^ 116 127 115 



Zygomatic breadth 153 148 141 



Mastoid breadth 158 149 126 



Palatal breadth at m 1 67 73 61 



Depth of skull between antlers no 112 94 



Upper toothrow, crown surface 95 99 98 



Diastema (canine to p 1 ) 72 72 55 



Distance between antlers below the burr 68 78 64 



Length of mandible, incisive border to angle 310 330 280 



Angle to tip of coronoid 135 148 148 



Depth at m f 37 38 32 



Length of lower toothrow 105 103 97 



Diastema 124 130 100 



Antlers, main beam to tip, along curvature 1170 1235 1000 



" greatest spread at point of palmation 800 875 860 



distance between tips of longest tines 900 790 655 



" points attipof main beam. 780 555 575 



Rangifer stonei is a striking member of the Caribou group, 

 resembling R. montanus in its dark coloration, but differing in 

 the great development of the heavy fringe of white hairs on the 

 front of the neck, and its striking contrast in color with the 

 adjoining portions of the neck. Should this prove constant it 

 will form an easily distinguishing mark. The antlers, fully illus- 

 trated in the accompanying figures (Figs. 1-4), from photographs, 1 

 recall in some respects those of the Barren Ground forms of 

 Caribou (including R. grcenlandicus], but they are much heavier, 

 with better developed and more numerous tines, a special feature 

 of differentiation being the large size and peculiar form of the 

 anterior branch. The skull is long and slender, the facial por- 

 tion especially narrow, the occipital broad, the nasals short, and 

 the lower jaw slender. 



1 The photographs are made to the same scale as those illustrating my paper on the Moun- 

 tain Caribou (this Bulletin, XIII, pp. 1-18), and I am indebted for them, as before, to the skill 

 of Mr. J. Rowley. 



[May, iqoi\ 10 





