of Horse from Central Asia. 17 
The only living representative of the former of these two 
genera was, in Gray’s opinion, our domestic horse, Hguus 
caballus. ‘To the latter he referred the djiggetai (Ascnus 
hemionus, Pall.), the common ass (Astnus vulgaris), the 
quagea (Asinus quagga, Gmel.), Burchell’s ass (Asinus Bur- 
chellit, Gray), and, lastly, the zebra (Astnus zebra, Linn.). 
(See Gray’s Revision of the Family Equide, in Zool. Journ. 
vol. 1. 1825, p. 241). 
In this article, | propose describing a new and existing 
representative of the family of undivided-hoofed mammals. It 
appears to be in some respects intermediate between our 
domestic horse and the wild ass; but a very important ex- 
ternal distinction places it properly in the genus Hquus, and 
not among the asses. This peculiarity in the new species I 
am about to describe consists in its having four warts or cal- 
losities, one on each front and hind leg; whilst every member 
of the asinine group has only two, on the inside of each fore 
leg, the hind legs being invariably free from them. ‘The 
warts on the hind legs of the domestic horse, as well as of the 
species I am describing, are on the inside of the hock, a little 
below the joint. 
From the following description, it will be evident that the 
new species closely resembles the domestic horse, both in 
shape of skull and in many other particulars, as, for 
instance, in the form of the hoof, absence of dorsal stripe, é&c. 
A new wild representative indigenous to the plains and deserts 
of Central Asia has therefore been added to the family of 
Equide, hitherto said to consist only of one genus, a repre- 
sentative, moreover, hitherto untamed by man; and in order 
to admit this new species, the classification of solid-hoofed 
mammals must undergo achange. Assuming the warts to be 
the most important generic distinction, the genera Hquus and 
Asinus rust henceforward be distinguished as follows. 
Genus 1. Equus. 
Verrucis brachiorum pedumque distinctis, artubus crassis; ungulis 
latis rotundatis ; cauda undique vel in dimidio posteriore setosa. 
1. Hquus caballus, Linn. 
Cauda undique setosa, juba pendula vel suberecta, capronis (2. ¢. 
jube partibus in frontem devexis [ Anglice ‘“ forelock”’}) longis ; 
loro dorsali plerumque distincto. 
2. Hquus Przewalskii, n. sp. 
Caude dimidio posteriore setoso; juba brevi, erecta ; capronis et loro 
dorsali nullis. 
Ann. & Mag. N. Hist. Ser. 5. Vol. viii. 2 
