498 DR. J. E. GRAY ON THE ROEBUCK OF PERU. [Noy. 11, 
middle of the back some of the dark fur of the animal sent by the 
Earl of Derby, which I described. 
As stated in my paper, this animal chiefly differs from the Roe- 
buck of Europe in being without any glandular tufts on the outer 
side of the metatarsus ; but we now discover that the horns are very 
peculiar, and unlike those of the Roebuck, or of the Tarush or 
Roebuck of Bolivia (Furcifer antisiensis), which is the type of the 
genus Furcifer. 
The male now obtained had a well-developed but rather unsym- 
metrical pair of horns, which are so unlike the horns of any other 
Deer, that I propose to form for them a genus, which may be termed 
XENELAPHUS. 
The horns divide from the base into two branches; the front 
one is erect, conical, and acute, with a short conical branch on the 
outer side, and in the middle one or two more or less elongate, basal 
anterior or interior snags. The hinder part of the base and sheath 
compressed, diverging horizontally into a strong, angular, tapering 
branch, which is nearly as long as the erect one, with several irre- 
gularly placed, more or less elongate, acute processes; the upper 
part, near the roots, with one or two cylindrical diverging branches 
on its upper and lower sides. Like the small branches on the erect 
part of the horn, they are not exactly similar on the two horns. 
Fig. 2. 
Skull of Xenelaphus huamel, 9. 
The metatarsus is without any glandular tuft on the outside. On 
the inner side of the hock is a large rounded tuft of such hairs. The 
fur consists of thick, elastic, tubular quills. The skull has a well- 
marked, deep, triangular pit in the front of the orbit. The female 
is without horns. This animal may be called Xenelaphus huamel. 
It has been suggested that, as I have only seen one specimen of 
