The anterior facial region in Gazelles, from the base of each horn to the muzzle, is cut off from the sides of the face on both sides by white streaks, which, starting externally to the base of each horn, run downwards to within two inches of the nostrils; the former I shall call the ‘_central facial band_,’ the latter the ‘_light facial streaks_.’ From the corner of the suborbital gland, running downwards immediately below the light facial streak, and of about equal width, is a dark line; this I shall refer to as the ‘_dark facial streak_.’ Bordering the white of the belly on each side, and extending from above and behind the ulna to above and in front of the patella, are two bands, the lower of which is darker, the upper lighter than the colour of the back and flanks. The former I shall speak of as the ‘_dark lateral band_,’ the latter the ‘_light lateral band_.’ Lastly, bordering the white of the rump is frequently seen a narrow indefinite darkish band, which may be conveniently called the ‘_pygal band_.’ The difficulty of expressing differences dependent to a large extent upon shades of colour and texture of hair sufficiently sharply to give a just impression of the effect produced by such differences upon the eye may cause the distinction of some of the forms below mentioned to appear doubtful. I can only say that upon occasions when I have had ample opportunity of subsequently verifying my identification, I have never experienced any difficulty in referring specimens entirely new to me to their proper name and habitat. The descriptions must be taken as applying to thoroughly typical specimens, the intensity of the markings and length and curvature of the horns being subject to great individual variation.” Since Sir Victor Brooke wrote his monograph of the Gazelles, many species only known to him by descriptions or by imperfect specimens have become represented in our National Museum by complete examples, while several additional species have been discovered. Our arrangement of the species is therefore necessarily different from his, but is, we fear, still very far from being perfect, as more and better specimens of most of the forms are still wanted before their exact geographical distribution, their extent of variation, and their true relationships to each other can be satisfactorily worked out. As already noted, we have removed from the genus _Gazella_, under the name _Antidorcas_, the South-African Springbuck, which Sir Victor Brooke included in it. This being eliminated, the 25 species which we are prepared to recognize as distinct may be arranged as follows:--