This Waterbuck is certainly very closely allied to Crawshay’s Waterbuck, and it is not easy to point out any material points of difference. The only specimens yet obtained being at Tring and those of _C. crawshayi_ in the British Museum, we have not been able to make a direct comparison. But it would appear that the present animal is generally more blackish in colour and has shorter and stouter horns. Besides this, the respective localities of the two forms are so remote that it would not be safe to unite them without evidence that the same animal occurs in intermediate localities. Mr. G. W. Penrice, the discoverer of this Antelope, and after whom it has been named by Mr. Rothschild, is resident, we are informed, at Cabo Submarino, near Benguela, the port and capital of the Province of the same name in the Portuguese Colony of Angola. During his hunting excursions in the interior Mr. Penrice came across specimens of it “near Bongo, on the banks of the Kuvali River, about one hundred miles south-east of Benguela and fifty miles from Caconda.” In a letter to Mr. Rowland Ward, Mr. Penrice says that it is “pretty numerous” in this locality, but “is not found nearer the coast.” He adds that these Antelopes “have a strong smell, and that he has often smelt them before sighting them. As a rule the bulls and cows are found in separate troops.” An account of Penrice’s Waterbuck has been given by Mr. H. A. Bryden, in an article published in ‘The Field’ of April 25th last; but few additional particulars are furnished concerning it, although a list of other hunting-trophies obtained by Mr. Penrice in the same district is added. As regards Benguela, Mr. Bryden tells us that it is a most difficult country to hunt in, it being almost impossible to keep horses alive there, and the bush being very thick and nearly impenetrable, while the climate, especially near the coast, is not healthy. Nevertheless, we hope it may not be long before we get from some of our energetic sportsmen further information respecting this little-known species of Waterbuck. Our Plate, which represents both sexes of it, has been prepared by Mr. Smit, by the kind permission of Mr. Rothschild, from the typical specimens in the Tring Museum. _August, 1896._ [Illustration: THE BOOK OF ANTELOPES, PL. XXXVI. _Wolf del. J. Smit lith._ _Hanhart imp._ The Defassa Waterbuck. COBUS DEFASSA _Published by R. H. Porter._] 62. THE DEFASSA WATERBUCK. COBUS DEFASSA (_Rüpp._). [PLATE XXXVI.] _Antilope defassa_, =Rüpp.= Neue Wirbelth. p. 9, pl. iii. (1835–40); =Reichenb.= Säugeth. iii. p. 133 (part.); =Wagn.= Schreb. Säugeth. iv. p. 423 (1844). _Redunca defassa_, =Rüpp.= Verz. Senck. Mus., Säugeth. p. 182 (1842). _Cervicapra defassa_, =Sund.= Pecora, K. Vet.-Ak. Handl. 1844, p. 195 (1846); =id.= Hornschuch’s Transl., Arch. Skand. Beitr. ii. p. 147 (1848).