Horns generally present in both sexes, the females of the first four species alone being without them. In the male the horns are strong, prominently ribbed, and generally of medium length, about the length of the head, but occasionally considerably longer. With the exception of their tips they are curved backwards, so as to be convex forwards below, while their ends are commonly more or less recurved forwards or upwards. The degrees of curvature seem to be fairly constant within the species, and to afford very fair specific characters. On the other hand, in the female the horns are slender, straighter, and shorter than in the male, very variable in direction, and as a rule showing little of the characteristic curvature peculiar to the male of each species, although there is a certain correspondence between the lengths of the horns in the two sexes. _Range of the Genus._ Northern and Eastern Africa, and Western and Central Asia to Mongolia and British India. The genus _Gazella_ contains the great majority of the members of the present subfamily, and forms a very natural and easily defined group. All the species are lightly built and delicate animals, and are among the best known of all the Antelopes, on account of their beauty and the fact that they are common in confinement, so that every zoological garden is always well provided with examples of them. In the Zoological Society’s Gardens at the present time no less than ten species are represented. The genus _Gazella_ was always a favourite one with Sir Victor Brooke, who devoted much time to its elucidation, and published in 1873 a monograph of it, which up to the present time has been the standard work on the subject. From this monograph we venture to quote the following paragraphs which explain the nomenclature of the characteristic markings of the Gazelles: they also give an indication of the difficulties to be met with in working out a genus which, while the largest contained in the present work, is remarkable for the close resemblance of the different species to one another and for the absence of characters which will enable them to be readily separated:-- “For the sake of convenience, and the avoidance of constant repetition, and also to throw into relief the traces of genetic affinity afforded by coloration, I will describe the typical ground-plan which may be seen underlying each variation, the uniformity of the arrangement of the more salient and characteristic markings (where they appear) throughout the group clearly showing the existence of such a plan. To each of these more prominent features, indicating what may be provisionally called generic coloration, I will apply a definite name, which I shall make use of in the following descriptions.