Size large, form graceful. Colour nearly all over white, the only parts which are of the usual rufous shade being the neck and anterior back, the sides and rump gradually shading off into white. Head and ears white, a faint rufous tinge on the centre line of the face. Neck deep rufous all round, except for a white spot on its anterior surface. Lower part of fore legs faintly rufous, rest of limbs and whole of tail white. Knee-brushes present. Skull, basal length in an immature male 8·85 inches, greatest breadth 4·15, muzzle to orbit 5·3. Horns of male thick, curved strongly backwards below, then hooked inwards and forwards above. Horns of female almost equally long, but comparatively thin, slightly curved, and not hooked terminally. _Hab._ Dongola and Sennaar. In concluding our account of the true Gazelles we come, at the end of the list, to a small but attractive group of three species which are closely related to one another, and take each other’s places as representatives in the different countries where they have been found. These three Antelopes are certainly nearly allied, and it is by no means improbable that, although all the accessible specimens known to us are distinguishable, intermediate forms will ultimately be found to link them together. It is especially likely that this will prove to be the case with the two western species, _G. dama_ and _G. mhorr_. All the three species of this group are exceedingly rare in collections, and we have been able to obtain but very little information about them, and very little material for comparison, the British Museum being badly off for specimens of all of them. It is to be hoped, however, that the prospective opening of the Soudan, by France on one side and England on the other, will lead to an increase of our knowledge of this group of Antelopes, and of the many other interesting forms of the great North-African desert. We will commence our account of these three Gazelles with the one which inhabits the eastern part of the Soudan, where our own countrymen may soon be expected to meet with it.