two new Central-African Antelopes. 387 
The following is an extract from Mr. Jackson’s letter to 
Messrs. Ward and Co.; and his remarks being quite borne 
out by an examination of the specimen, I feel myself at liberty 
to publish them :— 
“TJ 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 8. African animal. [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 Mau) into Turquel to 
the north and north-east of Mount Elgon it is very common, 
and takes the place of A. Coke?. Round Baringo it is fairly 
plentiful, but some marches south of Njemis the A. Coked 
takes its place.” 
While the presence or absence of the face-markings is in 
this group, owing to its constancy in the 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. Jacksoni first by B. Lichtensteini, which covers all the 
Zambesi region and Nyassaland, and then further north by 
B. Coket, these two species being members of totally different 
groups of the genus, and neither of them at all closely allied 
either to B. caama or to B. Jackson. 
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.). 
Horns: greatest length round curves in front 528; cireum- 
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 range 
northward of the saltpans near the Botletle River . . . and is unknown 
in the Matabele and Mashuna countries.” 
