232 CATALOGUE OF UNGULATES 



extends to base of ears, a large rump-patch, and under-parts 

 white. 



The three closely allied races into which the species has 

 been divided are distinguished as follows : — 



A. Ears bordered above with narrow black line ; 



rufous of tail extending part way into rump- 

 patoh. 



a. Colour deeper; mane well developed A. a. americana. 



6. Colour paler; mane rudimentary or wanting A. a. mexicana. 



B. Ears with heavy black border and white terminal 



third blackish externally ; rufous of tail 

 extending forwards to join that of back, and 

 thus completely dividing rump-patch A. a.iieninsularis. 



A. — Antilocapra americana americana. 



Antilooapra americana americana, Miller, List N. Amer. Mamm. 

 p. 393, 1912. 



Typical locality as above. 



General colour bright and deep ; margins of upper part 

 of ears narrowly bordered with black ; mane well developed ; 

 rufous of tail intruding into hind half of rump-patch, but 

 not dividing it into two halves. 



Fine horns measure from 15 to 17j (in one case 19) inches 

 in length, with a basal girth of from 5^ to' 6^ (7^ in one 

 case), and a tip-to-tip interval ranging from 5^ to 17^ inches. 



43. 11. 28. 3 (625, b). Skin, immature, mounted. North 

 America. Presented by the Hudson Bay Company, 1843. 



46. 3. 17. 11. Skull, female, immature. North America. 

 From an old skin (No. 43. 11. 28. 2). Same history. 



60. 2. 5. 11. Skull, with horns. North America. 



Purchased (Gerrard), 1860. 



60. 2. 5. 12. Skull, with horns. North America. 



Same history. 



72. 5. 6. 3. Skin, female, mounted, and skeleton. North 

 America. Purchased (Zoological Society), 1852. 



72. 12. 12. 2. Skin, mounted. Yellowstone. 



Purchased (ff. Wurd), 1872. 



70. 3. 15. 4. Skeleton, with horns, mounted. Yellow- 

 stone. Purchased (If. Ward), 1876. 



