Another good authority on Abyssinian Mammals, Theodor von Heuglin, has also told us that this little Antelope is very common in the Abyssinian coast-district, ranging north to the mountains of the Beni Amer, and westwards as far as Takeh. He says that it is more plentiful in the bushes on the borders of the hill-district than on the plateau of the sea-coast, and that it ascends the mountains to a height of 6000 feet. Finally, as is recorded by Dr. Giglioli, the Italian naturalists Boutourline and Traversi, who went to Shoa in 1884, obtained specimens of this Antelope much further south, at Assab. It is, however, quite possible that these last-named examples may have belonged to one of the allied species which next follow. Salt’s Dik-dik is represented in the British Museum by a mounted pair in the Gallery, of which the male was obtained by Rüppell and the female by Sir William Cornwallis Harris. There are also in that Collection skins of both sexes procured by Mr. Blanford during the Abyssinian Expedition, and a skeleton and skull collected by Mr. Jesse on the same occasion. Our figure of this Antelope (Plate XXX.) was put on the stone by Mr. Smit from a water-colour drawing by Wolf. This drawing, which was prepared under Sir Victor Brooke’s direction, is now in Sir Douglas Brooke’s possession. _December, 1895._ 53. SWAYNE’S DIK-DIK. MADOQUA SWAYNEI, THOS. _Neotragus saltianus_ (in part), =Swayne=, P. Z. S. 1892, p. 307. _Madoqua swaynei_, =Thos.= P. Z. S. 1894, p. 328 (Berbera); =Hoyos=, Zu den Aulihan, p. 185 (1895); =Swayne=, Somaliland, p. 318 (1895). VERNACULAR NAMES:--_Guyu_ of Somalia (_Swayne_), and, with the other Somali _Dik-diks_, _Sakáro_ as a generic name (_Swayne_). Similar in almost all respects to _M. saltiana_, but considerably smaller. Back grizzled grey, with a fulvous suffusion. Sides not, or scarcely, more rufous than back. Limbs pale rufous. Skull like that of _M. saltiana_, but much smaller. Basal length (male) 3·06 inches, greatest breadth 1·9, muzzle to orbit 1·6, tip of nasals to tip of premaxillæ 1·03. _Hab._ Northern half of Somaliland. In Northern Somaliland the place of Salt’s Dik-dik appears to be taken by two other forms, which were first discriminated by Thomas in an article upon these dwarf Antelopes read before the Zoological Society in April 1864. The present species Thomas named after the enthusiastic naturalist and sportsman Capt. H. G. C. Swayne, R.E., who called Thomas’s attention to its distinctness, and who first furnished the National Collection with specimens.