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 SUBSPECGIES: 
A. Horns flattened, recurved. PAGE 
a. ‘Colorsyellowishbrowi..-c8 oe ee A. americana 82 
bp Color. paler t ceo see ee A. a. mexicana 82 
64. americana (Antilope), Ord, Guth. Geog., 2d Am. ed., 1, 1815, 
Pp- 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.—mexicana (Antilocapra), Merr., Proc. Biol. Soc. Wash., xiv, 
TOOL ap. sil. 
MEXICAN PRONG-HORN. JBerendo 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. 
