30 
This series, as is evident, is quite insufficient to solve the vexed question 
as to the amount of distinctness of the four geographical forms or sub- 
species, which must remain open for future investigators. 
Our illustration of the adult male of this Antelope (Plate LX XVII.) was 
put on the stone by Mr. Smit, about twenty years ago, from a water-colour 
sketch by Mr. Wolf. It is now impossible to ascertain from what specimen 
this sketch was taken, but it is conjectured to have been from a skin and 
skull procured by Mr. Selous in 8.E. Africa. At the same time a wood- 
block of the head (fig. 90, p. 29) was drawn, which shows well the essential 
differences between the Roan Antelope and the Sable Antelope (see fig. 91, 
p. 38). 
January, 1899. 
