82 ANTILOCAPRA. 



Horns compressed at base; flattened process in front, end conical, 

 recurved; deciduous; lateral hoofs absent; hair stiff, coarse, brittle; 

 nose hairy, save a narrow line in the center; tail very short; horns in 

 the female rudimentary, or absent. 



KEY TO THE SPECIES AND SUBSPECIES. 



A. Horns flattened, recurved. PAGE 



a. Color yellowish brown .A. americana 82 



b. Color paler A. a. mexicana 82 



64. *americana (Antilope), Ord, Guth. Geog., 2d Am. ed., n, 1815, 

 p. 292, descrip. p. 308. 



americana (Antilocapra) , Elliot, Syn. N. Am. Mamm., 1901, p. 43. 

 PRONG-HORN ANTELOPE. 



Type locality. Plains east of the Missouri ? Black Mountains ? 



Geogr. Distr. Valley of Saskatchewan, latitude 53, south to 

 Mexico, and from Missouri River on plains westward to Rocky 

 Mountains and the Cascade Range in Oregon and Washington. 



Genl. Char. Size of domestic sheep with much longer legs and 

 neck; eyes large, gazelle like; no lachrymal gland; low mane on back 

 of neck. 



Color. Male. Upper parts and sides yellowish brown; band 

 between eyes covering forehead, nose, and a spot below ear, liver 

 brown; sides of head, spot behind ear, throat, front of neck extending 

 in two triangles reaching the brown on each side ; entire under parts 

 and rump white; legs yellowish brown; horns, hoofs, and naked skin 

 on nose black. 



Measurements. Total length, 1245; tail, 178; height at withers, 

 780. Skull: occipito-nasal length, 240; breadth between outer edge 

 of orbits, 136; width between orbits, 134; length of nasals, 96.5; 

 palatal arch to incisive foramina, 136; length of upper tooth row, 68; 

 width of palate between last molars, 56; length of mandible, 216; 

 length of lower tooth row, 70. 



a. mexic&na (Antilocapra), Merr., Proc. Biol. Soc. Wash., xiv, 



1901, p. 31. 

 MEXICAN PRONG-HORN. Berendo in Mexico. 



Type locality. Sierra en Media, State of Chihuahua, Mexico. 



Geogr. Distr. Northern Mexico in States of Sonora, Chihuahua, 

 and Tamaulipas. Lower California. 



*This species may possibly cross the United States and Mexican boundary 

 at some point in its range and go into Mexico, and is, therefore, included in 

 this volume. 



