_Adenota thomasi_, =Neumann=, P. Z. S. 1896, p. 192. _Cobus kob_, =Scott Elliot=, P. Z. S. 1895, p. 341 (Lake Albert-Edward). VERNACULAR NAME:--_Nsunnu_ or _Nsunu_ of the Waganda (_Speke_, _Lugard_, _&c_.). Size about as in _C. leucotis_, but form thicker and heavier (height at withers of an adult male 35½ inches). General colour rich fulvous. Area round eyes and another round bases of ears whitish; back of ears fulvous, with an indistinct tipping of black; hairs of inner surface of ears white. Muzzle, lips, chin, chest, belly, and inner sides of forearms and thighs white. Front of fore legs from middle of forearms downwards with a strongly defined black line, which broadens at the knees and pasterns; hind legs with a similar black mark, but only reaching up from the hoofs halfway towards the hocks. Remainder of limbs fulvous, an indistinct whitish ring just above the hoof; back of pasterns thickly hairy. Horns thick and strongly curved, attaining a length of about 17 or 18 inches. _Female_ similar, but without horns. Skull measurements (♂):--Basal length 10·4 inches, greatest breadth 4·6, orbit to muzzle 6·3. _Hab._ Kavirondo and Uganda. Thomas’s Kob, as it has been lately proposed to call the representative of this group of Antelopes in Kavirondo, Uganda, and the adjoining districts of Africa, after one of the authors of the present work, has been known for many years; but it has been unfortunately confounded with _Cobus leucotis_, _C. vardoni_, and _C. kob_, and has only been recently recognized as a distinct species. Although not unlike the White-eared Antelope, it is really much more nearly allied to the Kob of West Africa, of which it is in fact a larger form. From the Poku (_Cobus vardoni_) it is at once distinguishable by its black legs. The first specimens of Thomas’s Kob that reached England were two heads brought home by Speke on his return from his celebrated East-African expedition in 1863. These were examined by Sclater, and in his report on the Mammals of the expedition (P. Z. S. 1864, p. 103) were erroneously referred to _C. leucotis_. But a re-examination of one of the specimens, which is now in the British Museum, has convinced us that it is undoubtedly referable to the present species. Speke remarks that this Antelope, of which the native name is “Nsunnu,” is “found in Uganda, Unyoro, and Madi, but never south of those countries. They roam about in large herds in the thick bush and grassy plains, but never go far from water.”