582 AFRICAN GAME ANIMALS 



it has evolved a form with wide-spreading horns which has 

 been named rohertsi. 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, serengetcB, 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 rnuch 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, 3.Tt 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 



