_Bubalis jacksoni_, =Thos.= Ann. Mag. N. H. (6) ix. p. 386 (1892) (Kavirondo); =Ward=, Horn Meas. p. 58, fig. (skull and head) (1892); =Lyd.= Horns and Hoofs, p. 196 (1893); =Jackson=, Big Game Shooting, i. p. 291. _Bubalis caama_, =Junker=, Travels in Afr. iii. p. 172 (1892) (?). _Alcelaphus jacksoni_, =Lugard=, E. Africa, i. p. 532, and pl. p. 448 (head) (1893). VERNACULAR NAMES:--_Ssongoro_ in Niam Niam; _Nakibbih_ in Monbuttu (_Schweinfurth_); _Alwalwong_ of Djeng, White Nile (_Heuglin_); _Ngazi_ in Uganda (_Lugard_). Similar in most essential characters to _B. caama_, but the face is entirely without the black blaze always found in that species, being rufous like the rest of the head, and the horns are not so abruptly bent backwards above, the back of the last bend forming an even open curve. The body-colours of _B. jacksoni_ are, however, not yet accurately known, so that it is possible that other differences will hereafter be found to exist. Skull: basal length 16 inches, greatest breadth 5·7, orbit to muzzle 12·7; facial length 17·5, breadth of forehead 4·2. _Hab._ Interior of British Central Africa, north of Lake Baringo; Uganda; and probably extending northwards to the White Nile, and westwards into North-east Congoland. This Hartebeest, which is the northern representative of _B. caama_, has been most appropriately named after Mr. Frederick John Jackson, F.Z.S., the successful conductor of the expedition of the Imperial British East African Company to Uganda in 1889 and 1890[5], and the discoverer of the species, which, when previously met with, had always been confounded with other members of the genus. It should be recollected that, besides his merits as a geographical explorer, Mr. Jackson is an ardent zoological collector and observer. The splendid series of birds which he obtained during the expedition just spoken of, and which embraced examples of nearly 300 species, has been described by Dr. R. Bowdler Sharpe in five papers published in ‘The Ibis’ for 1891 and 1892. Dr. Sharpe’s account of this remarkable collection is rendered still more complete by Mr. Jackson’s excellent field-notes which accompany it. Mr. Jackson has also published some very interesting remarks on the Antelopes of British East Africa in one of the recently issued volumes of the Badminton Library upon ‘Big Game Shooting.’