500 AFRICAN GAME ANIMALS 



and the ears are much more broadly tipped by seal-brown, the 

 whole terminal half being dark. The rufous of the forehead 

 is lined by black, but is not uniform as in the male. The 

 tail on the dorsal surface is rufous, only the tip being seal- 

 brown. 



A large male had the following flesh measurements: head 

 and body, 79 inches; tail, 21 inches; hind foot, 22 inches; ear, 

 9 inches. The average length of an adult male skull is i^}4 

 inches. The largest is i8>^ inches, which equals large skulls 

 of ugandcB from the Semliki River. The female skulls are 

 smaller, usually 14^ inches in length. The horns of large 

 bucks are seldom more than 25 inches in length, the longest 

 in the National Museum being 28^ inches. 



In the eastern limits of its range on the German border 

 this race associates with the common waterbuck, K. ellipsi- 

 prymnus, living with it in the same meadows, but keep- 

 ing apart in herds of its own kind. Captain Dickinson in 

 "Big Game Shooting on the Equator" describes such asso- 

 ciation of the two species on the border. The common 

 waterbuck has been reported as far west as Ikoma, German 

 East Africa, on the headwaters of streams flowing to the 

 Victoria Nyanza. 



Laikipia Defassa 



Kobiis defassa tjaderi 



Cobus defassa tjaderi Lonnberg, 1907, Arkiv. Zool., Stockl., IV, p. 7. 



Range. — Laikipia Plateau west to the eastern edge of 

 the Rift Valley, north as far as Lake Baringo, and south to 

 Mount Suswa, at least. 



Recently a specimen of the defassa shot by R. Tjader at 

 the extreme eastern limits of the species near the junction 

 of the Guaso Narok and Northern Guaso Nyiro Rivers has 

 been described as a new race by Lonnberg. The characters 

 of this form are its dark coloration, the head being especially 

 dark, the black color of the snout extending far up the fore- 

 head well into the interorbital area of the forehead. In size 

 it is somewhat smaller than the other races. 



