About the same time also the South African Museum received specimens of this Antelope from the Lake Ngami district, through Mr. J. J. Wilson, of Otjimbinque, and Messrs. Chapman. Mr. Layard, in his Catalogue of the Mammals of that Museum, published in 1861, refers these specimens very doubtfully to _Tragelaphus eurycerus_, but shows very clearly by his description that they really belonged to the present species. Sir John Kirk, in his article on the Mammals of Zambesia, read before the Zoological Society in 1864, mentions the “Nakong” as frequenting the papyrus and rushes on the River Chobé. He naturally refers it to _Tragelaphus spekii_, with which, until quite recently, it was generally believed to be identical. In the same way Sir Victor Brooke, in his article on Speke’s Antelope and its allied species, published in the Zoological Society’s ‘Proceedings’ for 1871, comprises in his list of specimens of _Tragelaphus spekii_ those of the two allied forms, which we here treat of as probably distinct. Of these, his specimens “_h_” (“frontal bones, horns, and feet, in the collection of Mr. Oswell”) are, no doubt, referable to _Limnotragus selousi_. Mr. Selous, in his excellent and often-quoted article on the Antelopes of Central South Africa (P. Z. S. 1881, p. 753), writes of this species (which Mr. Rothschild has appropriately named after the famous hunter) as follows:— “This Antelope is only met with in the extensive swamps which exist in some parts of the interior of Africa. In the reed-beds of the Mababe, Tamalakan, and Machabe rivers it is to be found; and in the vast marshes through which the Chobe runs it must exist in considerable numbers, although, as it only emerges from the dense reed-beds at night, it is scarcely ever to be seen. In 1879 I tried hard to shoot some of these animals on the Chobe, searching for them in a canoe amongst the reed-beds at early dawn and after sunset; but though I disturbed several, and heard them splashing away amongst the reeds and papyrus, I only saw one female alive, though one morning I found a fine ram lying dead that had evidently been killed fighting with a rival during the night. The head and feet of this animal I preserved. The female that I saw was standing breast deep in the water, in the midst of a bed of reeds, feeding on the young shoots that just appeared above the water. When she saw us she at once made off, making a tremendous splashing as she plunged through the water. The natives told me that very often when these Antelopes are met with under similar circumstances they do not attempt to run, but, sinking down in the water, submerge their whole bodies, leaving only their nostrils above the surface, and trusting that their enemies will pass them unobserved; they (the Kafirs) then paddle close alongside and assegai them from the canoe. As all the Situtungas the skins of which I saw had been killed with assegais, and not shot, I have no