Article II. NEW FORMS OF THE MOUNTAIN GOAT 

 (OREAMNOS). 



By J. A. ALLEN. 



The type locality of Oreamnos montanus (Ord) is given by 

 Miller and Rehn (Proc. Boston Soc. Nat. Hist., XXX, No. i, 

 Dec. 1901, p. 23) as the "Cascade Range, near the Columbia 

 River, in Oregon and Washington." A comparison of speci- 

 mens of Oreamnos from the Cascades of northern Washington 

 with others from Montana and northern British Columbia 

 shows that the species commonly recognized as 0. montanus 

 is separable into three geographical forms, namely, (i) O. 

 montanus montanus from the Cascades, (2) a much larger form, 

 with longer and narrower skull, from British Columbia, and (3) 

 a much smaller form, with the same type of skull as the last, 

 from Montana and Idaho. As the pelage in all the forms is 

 white, the distinctive characters must rest on size and the 

 form of the skull, so far as present material is available. These 

 forms may be distinguished as follows : 



Size medium, skull broad O. montanus montanus (Ord). 



Size large, skull narrow O. montanus columbianus, subsp. nov. 



Size small, skull narrow O. montanus missoula, subsp. nov. 



The material available for the present comparison consists 

 of 19 specimens, of which 3 are from the Cascades of northern 

 Washington, 7 from British Columbia (4 from the Shesley 

 Mountains, northern British Columbia,' and 3 from near 

 Golden, southern British Columbia), 8 from Montana (mainly 

 from Missoula County), and i from Idaho. They include adult 

 males of each of the three forms, and adult females and young 

 males of two of them. 



Oreamnos montanus montanus (Ord). 



Old male skull (No. 14890, Cascade Mountains, northern Washing- 

 ton, Prof. L. L. Dyche), occipito-nasal length, 312; basal length of 

 Hensel, 270; zygomatic breadth, 114; interorbital breadth, 95; width 

 of maxillary region above m 2 , 86.5 ; nasals, 104 x 34; length of palate, 



