What little we know of this Gazelle is chiefly due to the researches of the late Baron Theodor von Heuglin, an energetic collector and observer of the Mammals and Birds of North-eastern Africa, whose name we have already had frequent occasion to mention in the pages of this work. In the absence of any better designation, we have selected “Heuglin’s Gazelle” as its English name, which is so far applicable that, besides being its first describer, Heuglin is the only naturalist that has recorded observations on it as met with in its native wilds. Heuglin passed several months in the fertile territory of Bogos, north of Abyssinia (now, we believe, included in the Italian colony of “Eritrea”), when attached to the German expedition sent out in search of the much-lamented traveller Dr. Eduard Vogel. He thoroughly explored this country, which is traversed by the River Anseba, and discovered many new birds and mammals, which were subsequently described in his various works. Amongst the mammals was the present species of Gazelle, which he met with only “on the bushy plains round Ain-Saba from 3000 to 5000 feet above the sea-level, in small families of from three to six individuals.” In his original description Heuglin called this Gazelle _Antilope melanura_, but subsequently altered its specific name to “_tilonura_,” there having been already an _Antilope melanura_ of Bechstein, which term is, however, a useless synonym of the Oribi (_Ourebia scoparia_). We have not been able to discover what the term “_tilonura_” means, but follow the change, which has been adopted by Sir Victor Brooke and other authors. Little more, we regret to say, can be told of this beautiful species, which is readily distinguishable amongst its congeners by its broad black lateral stripe and lyre-shaped horns with incurved points. Sir Victor Brooke gave a figure of it from a stuffed specimen in his own collection to illustrate his article on the Gazelles in the Zoological Society’s ‘Proceedings’ for 1873. Our figure (Plate LXVI.), which was prepared by Smit under the direction of Sir Victor Brooke, was probably taken from the same specimen, now in the British Museum, to which it has been presented by Sir Douglas Brooke. It was obtained in Bogosland by Essler about 1872. Four other examples of this Gazelle procured at the same time by the same collector are also in the National Collection. From two of these the accompanying illustrations of the head and horns (figs. 71 & 72, p. 160) have been prepared by Mr. Smit. _May,_ 1898. [Illustration: THE BOOK OF ANTELOPES, PL. LXVII. _Wolf del. J. Smit lith._ _Hanhart imp._ The Red-fronted Gazelle. GAZELLA RUFIFRONS. _Published by R. H Porter_] 97. THE RED-FRONTED GAZELLE. GAZELLA RUFIFRONS, GRAY. [PLATE LXVII.]