tuo new Central-African Antelopes. 387 



Tlic following is an extract from Mr. Jackson's letter to 

 J^Icssrs. Ward and Co. ; and his remarks being quite borne 

 out by an examination of the specimen, I feel myself at liberty 

 to publish them : — 



" I do not think it is likely to extend further south, but of 

 course it may extend to the Cape for what we know ; if it is 

 Alcelaphus caama it may do so, but I am inclined to doubt 

 its being the same as the S. African animal. I seem to have 

 an idea that the one at the British Museum is very much 

 darker and the horns different, but this is only from memory, 

 and I cannot be sure. Up north all along the top of the 

 Elgeyo Escarpment (continuation of i\Iau) into Turquel to 

 the north and north-east of jMount Elgon it is very common, 

 and takes the place of A. Cohei. Round Baringo it is fiiirly 

 plentiful, but some marches south of Njemis the A. Cokei 

 takes its place." 



While the presence or absence of the face-markings is in 

 this group, owing to its constancy in tlie adult, a very good 

 character, the distinction of this species rests largely on 

 geographical considerations. The true B. caama is purely 

 South African *, and its range is absolutely shut off from that 

 of B. Jaclcsoni first by B. Lichtensteini, which covers all the 

 Zambesi region and Nyassaland, and then further north by 

 B. Cokei, these two species being members of totally different 

 groups of the germs, and neither of them at all closely allied 

 either to 13. caama or to B. Jaclcsoni. 



The following are the measurements of the typical skull 

 of B. Jacksoni: — 



Basal length 406 millim., greatest breadth 140, length of 

 nasal bones 220 ] profile, length from tip of nasals to top of 

 frontal crest between horns 450. Distance from tip of horn 

 to end of muzzle in a straight line 888 ( = 35 in.). 



Ilorns : greatest length round curves in front 528 ; circum- 

 ference at base 305 (==12 in.) ; distance from tip to tip 220. 



It is with great pleasure that I connect with this magnificent 

 new antelope the name of Mr. Jackson, whose discoveries, 

 both zoological and geographical, in the region which it 

 inhabits have rendered his name familiar to all interested in 

 our East-African possessions. 



The second antelope, the Wildebeest or Brindled Gnu, is 

 one which is likewise allied to a South-African species, but 



* Selous (P. Z. S. 1881, p. 763) says, " It does not extend its rano'e 

 northward of the saltpans near the Botletlie River . . . and is unknown 

 in the Matabele and Mashuna countries." 



