132 
Dimensions :— 2. Height at withers 50 inches, ear 4, hind foot 12. 
Skull (@): basal length 10°5 inches, greatest breadth 5, muzzle to 
orbit 6°5 
Hab. Liberia. 
The present Duiker nearly equals the preceding species in size, but, as 
will be seen by the Plate, is immediately distinguishable by marked differ- 
ences in colour, its black head and neck rendering it very conspicuous. Its 
discovery is due to Mr. F. X. Stampfli, a naturalist who made two expeditions 
to Liberia, in 1884 and 1886, to collect specimens for the Leyden Museum. 
In the first of these he was alone; in the second he was accompanied by 
Mr. Biittikofer, the well-known Conservator of that institution. 
The Black-headed Duiker was first described by Dr. Jentink, the Director 
of the Leyden Museum, in 1885, from a single female specimen procured 
near Schieffelinsville, on the Junk River, by Stampfli in the preceding year. 
Unfortunately Dr. Jentink referred the specimen to C. longiceps of Gray, 
a species based on a skull brought home from Gaboon by Mr. DuChaillu. 
In doing this he was perfectly justified, on account of the extraordinarily 
close resemblance of its skull to that of C. longiceps. But Thomas subse- 
quently showed that DuChaillu’s Gaboon skull (as already mentioned above) 
is undoubtedly referable to the nearly allied C. sylviculiriz. Under these 
circumstances it became necessary to give another scientific name to the 
present species, and ‘Thomas selected the appropriate term jentinkt ; as it 
was Dr. Jentink’s “ carefulness, led astray by Dr. Gray’s serious mistakes,” 
that had ‘caused him to make the venial error just referred to.” 
During his second expedition, in 1887, Mr. Stampfli procured two more 
examples of this Antelope on the Farmington River. Like the first, both 
these were females, and, as we are told by Dr. Jentink, do not differ in 
colour from the typical specimen. Mr. Stampfli’s notes on this Antelope are 
as follows :— 
“A little below Schieffelinsville, in the triangle between the Junk River 
on one side and its two confluents, the Du Queah and Farmington Rivers, on 
the other, a wooded eminence called ‘Sharp Hill’ rises in the middle of the 
marshes, to which, according to the testimony of the natives, these animals 
are restricted. As in the dry season the marshes cannot be traversed in 
canoes, and yet are not sufficiently dry to be passed on foot, these Antelopes 
