Hemprich and Ehrenberg state that they had originally intended to have called this species _Antilope ensicornis_, but that they eventually gave up their proposed designation for the term adopted by Lichtenstein. The same was the case also with nearly all the leading authorities subsequent to Lichtenstein, so that to attempt to restore the name “_leucoryx_” to what is probably its proper owner would now only create confusion. We prefer therefore to designate the present species as _Oryx leucoryx_ (Licht.), to which name it is undoubtedly entitled. After giving an accurate description of the present animal, and figures of the two specimens brought home, which, although of not first-rate quality, are perfectly recognizable, Hemprich and Ehrenberg inform us that they met with it in Dongola, between Ambukol on the Upper Nile and Simrie near Chor-el-Lebben, where they hunted it along with the Arabs on horseback. In Dongola and Kordofan, they proceed to tell us, this Antelope is met with in herds in the deserts. Its flesh is much appreciated by the Arabs, and is dried and laid by for future use, being likewise often sold in the markets. Its skins are used for shields and sandals, but are not considered of first-rate quality for these purposes. The Arabs of the Kubabish tribe, they inform us, call this Antelope “_Abu-harb_,” and state that it lives chiefly on the leaves and twigs of the acacias (_Acacia textilis_ and _A. ehrenbergi_) which are found in the valleys of the desert in this district. The next great explorer of North-eastern Africa, Rüppell, does not add much to our knowledge of the present species, which, in his list of Antelopes in the ‘Neue Wirbelthiere,’ he tells us, lives in herds in the deserts of Nubia and also in Egypt proper, as far north as the borders of the Fayoum. He comments, however, upon its confusion by Lichtenstein with the _A. leucoryx_ of Pallas, and calls it _Antilope algazella_, after Buffon. Our third leading authority on North-African mammals, Theodor von Heuglin, informs us that the Leucoryx was only met with by him in Southern Nubia and Kordofan, and in the oasis of El-Kāb, west of Dongola. But, according to the Central-African traveller Nachtigal, the range of this species extends into Borgu and Tibeste, while Barth in 1850 met with it in the hills of Air or Asben, north of Agades, in about 19° N. lat. and 9° E. long. Proceeding still further westward, we may state that there can be little doubt that the Leucoryx was formerly met with in the southern part of Tunisia, although at the present epoch it seems to be nearly, if not quite, extinct in the Beylik. When Sclater was in Tunis in 1898 he observed a stuffed specimen of a young Leucoryx Antelope in the palace of the Bey at Marsa, and was told that it had been originally received alive from the southern frontiers of Tunisia (see P.Z.S. 1898, p. 280).