Merrium Two New Bighorns <md a New Antelope. 31 



ness and depth of the lower jaw. No skins have been ex 

 amined. The new form may be known as follows: 



Ovis canadensis auduboni subsp. nov. 



Type from 'Upper Missouri'. No. aWxV cT yg-' acl - U. S. National 

 Museum. Believed to have been collected in the Badlands of South 

 Dakota in 1855 by Dr. F. V. Hay den, on the Warren Expedition.* 



Characters. Qv/te large; skull and horns broad and massive; molar 

 teeth much larger than in any known American sheep, the upper tooth- 

 row in adult males measuring 96 mm. or more, and the 3 upper molars 

 C3-65 mm. Underjaw (in type specimen) massive, heavy posteriorly, 

 deeply bellied (depth under last molar 52 mm.); angle broadly rounded. 

 In canadensis the jaw is light throughout and the angle, while small, is 

 marked. Horns narrower and as a rule longer than in canadensis. 



The animal is named in honor of Audubon, who in 1843 obtained from 

 the Badlands specimens which he supposed the same as the Rocky 

 Mountain species. f 



In the desert region of northwestern Chihuahua, not far from 

 Lake Santa Maria where the new Ovis mexicanus was obtained, 

 Mr. Nelson and Mr. Goldman secured a series of eleven Prong- 

 horn Antelopes. Comparison of these specimens with speci 

 mens from the northern Plains develops differences which seem 

 to necessitate the separation of the southern from the northern 

 animal. It may be known as follows: 



Antilocapra americana mexicana subsp. nov. 



Type from Sierra, en Media, Chihuahua, Mexico. No. 98,742 <? yg. 

 ad. U. S. National Mtfseum, Biological Survey Coll. Collected October 

 4, 1899, by E. W. Nelson and E. A. Goldman. Grig. No. 13,989. 



Characters. Similar to A. americana but paler (in fresh fall pelage 

 drab brown with a tinge of ecru, becoming cinnamon when the tips of 

 the hairs wear off); mane absent or reduced to a narrow line of dark 



*The U. S. National Museum register contains entries of several 

 Mountain Sheep collected by Dr. F. V. Hayden on Lieut. G. K. Warren's 

 Expedition to the Upper Missouri in 1855. In Lieut. Warren's report on 

 his 'Explorations in the Dacota Country in the year 1855' (published in 

 1856), Dr. Hayden states that the bighorn was abundant in the region 

 known as the badlands, and the narrative shows that the particular bad 

 lands meant are those between the Cheyenne and White Rivers in South 

 Dakota. 



fQuadrupeds of North America, Vol. II, pp. 163-172. 1851. 



