582 
AFRICAN GAME ANIMALS 
it has evolved a form with wide-spreading horns which has 
been named robertsi. At the northwestern corner another 
race appears, brighti , which is the palest and the least 
banded of all. Near the coast at Kilimanjaro we find the 
darkest race, serengetcz , which is somewhat intermediate 
in color with the closely allied petersi. The latter species 
carries the granti type still farther west and north to the 
mouth of the Tana River. Peters gazelle is much smaller 
and darker than any of the races of granti and is not known 
to intergrade. Occupying the central part of the range 
and also the most elevated region we have roosevelti. Lying 
between this elevated region on the southern edge of the 
Abyssinian desert we meet with the shorter-horned race 
known as raineyi. The horns reach their maximum spread 
in the southern race robertsi , but are also wide-spread and 
large in the neighboring typical granti. As we go north¬ 
ward the horns become more parallel and shorter until the 
extreme is reached in narrowness and shortness in brighti , 
inhabiting the country draining into Lake Rudolf from the 
west. Notata is apparently a highly colored local form 
occurring only on the high plateau flanking the Lorogi 
Mountains on the southwest and bears no very close rela¬ 
tionship to the other races. The highland races known as 
roosevelti and robertsi are grazers, while the desert forms, 
such as brighti and raineyi , are browsers. A structural 
difference in these races has been noticed which can be 
traced to differences in food habits. In the browsing races 
the snout has become enlarged as indicated by the greater 
length of the narial chamber. In raineyi the length of the 
nares from the tip of the nasal bones to the end of the pre- 
maxillaries or snout is much greater than the length of the 
nasal bones. In roosevelti , which is typically a grazer, the 
length of the nares is much less, equalling or only slightly 
exceeding the nasals in length. 
The Grant may be defined as a large-sized gazelle with 
immense horns, striped face, white rump patch, and white 
under-parts. The horns reach the maximum size among 
gazelles, ranging in the male from 20 to 30 inches in length 
along the curve. They are very heavy basally, where they 
are much compressed, or flattened laterally. They ascend 
vertically above the orbits and curve backward, ranging 
