Merridm — Two New Bighorns and 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. ^Wtt S' yg--ad. U. S. National 

 Museum, lielieved to have been collected in the Badlands of South 

 Dakota in 18.5.5 by Dr. F. V. Hayden, on the Warren Expedition.* 



Characters. — Size 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 

 63-65 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 tnexicanus 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. 



7'i/pe from Sierra en Media, Chihuahua, Mexico. No. 98,742 (^ yg. 

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

 4, 1899, by E. W. Nelson and E. A. Goldman. Orig. 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 Counti*y in the year 1855' (published in 

 18.56), 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. 



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



