Dr. J. E. Gray o?i the Gueinul. 309 



2. Xenelaphus anomalocera, from Tinta in the Peruvian 

 Andes. 



3. Huamela leucotis [Capreolus leucotis^ Grray, P. Z. S. 1849, 

 p. 64, t. xii.),from the Magellan Straits. 



These three animals differ in size — Furcifer antisiensis being 

 the smallest, and Huamela leucotis the largest. They differ in 

 colour : they all seem to have a summer and winter fur ; 

 but in each state they are to be distinguished by the colour of 

 their fur. They differ in the form of the skull and the size of 

 the pit for the tear-gland. 



They have each a peculiarly formed horn, and hence are re- 

 ferred to three different genera. It has been thought, as we only 

 have one male of Xenelaphus, and the horns are very peculiar 

 and the two sides unlike, that the specimen described and 

 figured may be a monstrosity and not the usual form of the 

 genus ; but should this be the case, which I do not think is 

 likely, the surface of the horns and the form of the less- 

 developed horn of the more usual shape, and which may be 

 regarded as the normal shape of the species, is so unlike the 

 horns of either of the two other species that, independently of 

 the consideration of the size and colour of the animal and of 

 the shape of the skull, it must be considered a most distinct 

 species ; and, as I said in my original description of Xenelaphus 

 (P. Z. S. 1869, p. 498), "if they (the horns) are not quite of 

 the normal form, it is clear they are not a monstrosity of 

 the regular forked horns of a Furcifer'''' (Cat. Ruminants, 

 p. 89). 



MM. Gay and Gervais, in the 'Ann. Sci. Nat.' 1846, 

 p. 91, describe a young deer without horns in the Paris 

 Museum, which Gay brought from the higher regions of 

 Chili, under the name of Cervus chilensis, observing that it 

 is very like in size, skull, and fur to Cervus antisiensis of 

 D'Orbigny, but that it is too young to have horns to com- 

 pare with the horns of that animal. Gay, in the Atlas to 

 his ' Historia de Chile,' figures this young animal and the 

 skull. 



Dr. Philippi, in Wiegmann's 'Archiv' for 1870, p. 46, says 

 that Gay's animal is C. antisiensis of D'Orbigny, perhaps 

 believing that there was only one South-American roebuck. 



The figure of tlie skull is very like the skull Avhich Mr. 

 Whitely brought from the Peruvian Andes, and which I called 

 Xenelaphus anomalocera. 



The figure of the young animal is very like that of the skin 

 in winter fur which we received from Lord Derby, from the 

 coast of Peru. The figure of it and the skin agree with the 

 specimens of Xenelaphus we received from Mr. Whitely in 



