129 
Yellow-backed Duiker seems to have a somewhat extended distribution along 
the western coast of Africa, reaching altogether from Liberia to the Congo. 
A pair of mounted specimens anda skeleton in the British Museum were 
transmitted from Fantee by the native collector Aubinn. The same collection 
also contains skins from Lagos, procured by Sir Alfred Moloney, and two 
skulls and a skin from Gaboon, brought to England by Mr. DuChaillu on 
his return from his celebrated gorilla-hunting expedition. Upon one of 
these skulls in 1865, Dr. Gray established his Cephalophus longiceps, and 
upon the second skull and the skin which accompanied it, in 1871, the same 
Fig. 16a. 
Skull of Cephalophus sylvicultix, jr. 
(P. Z. S. 1871, p. 594.) 
author based his C. melanoprymnus. Thomas has shown (P. Z. 8. 1892, 
p. 416) that both these names are merely synonyms of C. sylviculiria*. We 
may add we have as yet no information as to the range of this species into 
the interior, except that Herr Matschie has recorded its occurrence in Togo- 
* From Loanda, further south, the Lisbon Museum received, in 1869, the head of a large 
Duiker, which our friend Dr. Barboza du Bocage referred, rightly as it now proves, to Gray’s 
C. longiceps. Afterwards, however, in 1878, struck by the great development of the rufous crest, 
of which no mention had been previously made, he distinguished it as C. ruficrista. Thanks 
to his kindness we have now had an opportunity of comparing the typical head with those 
of the mounted specimens in the British Museum, and find it to be unquestionably the same, 
although, as the latter are very old, the rufous crests have been worn off and but little trace of 
them is left. Our figure (Plate XIV. fig. 2) shows, however, that in rather younger animals the 
crest is both well developed and very much of the same rufous colour as in the Lisbon example. 
T 2 
