THE GAZELLES AND THEIR ALLIES 593 
size and more wide-spread horns. It differs from lacuum 
by darker coloration and the presence in the adult female 
of a dark flank band. From roosevelti it may be distin¬ 
guished by the decidedly smaller and more parallel horns 
and by the smaller and lighter-colored dark nose spot. 
The dorsal color of the adult male is light vinaceous- 
cinnamon, paling toward the head and on the sides, where 
it becomes pinkish-buff. The top of the rump and the 
hinder border of the thighs is marked by a wide area of 
pure white, which is continuous with the white basal por¬ 
tion of the tail. The terminal half of the tail is black. The 
rump area is bordered in front by a bistre pygal stripe 
one-half inch wide. The flanks have a very slight indication 
of the flank band in the form of a lighter band of light 
buff bordering the broad band of pinkish-buff above. The 
outside of the legs is pinkish-buff like the sides of the body. 
The hoofs in front are bordered by brown hair. The under¬ 
parts and the inside of the legs and the lower throat are 
silky white. The top of the head and the median line of 
the snout are cinnamon-rufous. The middle of the snout 
is marked by a dark sepia blotch. There is a grayish patch 
about the horn bases and a blackish one above the eyes. 
The sides of the face are marked by a broad white band 
above the eye extending forward to the dark snout spot, and 
bordered below by an ill-defined, narrow dusky-cinnamon 
streak from the eye to the muzzle. The orbital area is 
white with a bistre-brown supraocular spot extending to 
the horn base. The tip of the snout is pale pinkish-buff. 
The lips and chin are white. The forethroat is white like 
the chin, but the midthroat is pinkish-cinnamon like the 
nape. The ears are pinkish-cinnamon, bordered at the tip 
by bistre, and the inside and the base are white. The adult 
female is like the male in color, but has a well-marked dark 
flank band and broader and darker pygal stripes. The 
nursing young are buffy-drab in color, as described under 
roosevelti. 
Specimens collected by the Rainey expedition have been 
examined from the desert country watered by the Northern 
Guaso Nyiro from the junction of the Ngare Narok down 
as far as the Lakiundu junction. North of this latter point 
specimens have been examined from Karo, Longaya, and 
