The Common Duiker no doubt extends far up the west coast of Africa. Although not mentioned by Andersson or Bains as occurring in Damaraland, it has been recorded by M. Du Bocage as having been obtained by Anchieta in Angola, and there are specimens in the British Museum from the same country transmitted by Gabriel, upon which Gray established his species _Grimmia splendidula_. But along the eastern side of Africa the range of this little Antelope, or of slightly representative forms, which at present we are quite unable to distinguish, is much more extensive. The Duiker is found throughout the Transvaal, and the great hunter Mr. F. C. Selous informs us that during his extensive journeyings north and south of the Zambezi, except in districts devoid of bush or covered by steep rocky hills, he has always met with this Antelope. According to this experienced observer, individuals, though shot in the same district, vary much in colour, some skins being of a greenish tinge and others of a reddish brown, while specimens from the borders of the Kalihari have less white upon the belly than others. Contrary to Cornwallis Harris and other testimony, Mr. Selous states that the females are almost always hornless, though he had met with three examples of this sex bearing horns. On the Zambezi and elsewhere in Mozambique Peters met with specimens of this Antelope, which he described and figured in his ‘Reise’ as new species under the names _Antilope altifrons_ and _A. ocularis_. These names are now generally regarded as synonymous with _Cephalophus grimmi_. A third name, without any mention of the other two, has recently been added from the same region by Dr. Lorenz, and this we are equally unable to recognize as valid. Throughout Nyasaland, as we are assured by Mr. R. Crawshay (P.Z.S. 1890, p. 661) the Duiker is very generally met with, except on the bare open plains or in very steep rocky country. Like Mr. Selous, Mr. Crawshay notices the variation in colour of this Antelope, which ranges from a reddish brown, not unfrequently tinged with green, to almost a dark red, while in some specimens the belly is more conspicuous for whiteness than in others.