ANTELOPES. 



37 



generally developed in both sexes ; there are frequently brushes of [Lower 

 hair on the knees. Gazelles may be divided into groups. The one Mammal 

 to which the Arabian Gazella dorcas (1130) belongs is charac- Oases^' 

 terised by the presence of lyrate or sub-lyrate horns in both sexes, 54-56.] 

 and by the white of the buttocks not extending on to the haunches. 

 Nearly allied is the group including the Indian G. bennetti (1 131) 

 and the Arabian G. arabica (1132), in which the horns have a 

 somewhat §- sna P e d curvature in profile. In the African group, 

 represented by G. granti (1133, fig. 19), G. thomsoni (1134), 

 G. mohr (1 135), etc., the white of the buttocks often sends a pro- 

 longation on to the flanks, the horns are long, and the size is large . 

 G. gutturusa (1136), G. subgutturosa (1137), and G. picticaudata 

 (1133), form an Asiatic group in which the females are hornless, 

 and the face-markings inconspicuous or wanting. The series of 

 Gazelles exhibited is too large for detailed notice. 



The Springbuck. The Springbuck {Antidorcas euchore, 1122) is [Case 54] 

 OenuS nearly related to the Gazelles, from which it is 



Antidorcas. distinguished by the presence on the middle of 

 the loins of an eversible pouch, lined with long white hairs capable 

 of erection. It has also one premolar tooth less in the lower jaw. 

 Formerly these beautiful Antelopes existed in countless numbers 

 on the plains of South Africa, and were in the habit of migrating 

 in droves which completely filled entire valleys. Now they an; 

 comparatively rare. They derive their name from their habit of 

 often leaping high in the air when on the move — a habit shared 

 with the Indian Blackbuck. Like the next four Antelopes, the 

 Springbuck represents a genus by itself. 



The Dibatag. ^he Somali Dibatag, or Clarke's Gazelle, Ammo- [C ase 54,] 



Genus dorcas clarkei (1121), forms a kind of connecting 

 AmmOliorcaS. link between the Gazelles and the Gerenuk ; this 

 being especially shown in the skull. The face shows the ordinary 

 Gazelle-markings; but the rather short horns — which are wanting in 

 the female — have a peculiar upward and forward curvature, quite 

 unlike that obtaining in the true Gazelles, and somewhat resembling 

 those of the Reedbuck. The neck is longer and more slender than 

 in ordinary Gazelles, and the tail is likewise relatively long. 

 Although local, these animals are fairly common in the interior of 



