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 15^2 
inches. The largest is i8>^ inches, which equals large skulls 
of ugandce 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. ellipsis 
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 
Kobus 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. 
