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Show 420 MR. O. THOMAS ON THE ANTELOPES [May 17, Skull-basal length 160; greatest breadth 80 ; orbit to gnathion 91*5; nasals, length 69, greatest breadth 34; muzzle 61; upper molar series 50. Hab. Cameroons [Buchholz, fide Peters]. Gaboon [Du Chaillu (Brit. Mus.)]. The type of Gray's C. aureus, which I refer with some doubt to this species, is a young animal, and the differences in coloration are probably due to this cause. Its body is far brighter and more fulvous than that of the adult, the withers and shoulders are browner, and the caudal tuft is more abundantly mixed with white. 6. CEPHALOLOPHUS LEUCOGASTER, Gray. Cephalophus leucogaster, Gray, Ann. Mag. N. H. (4) xii. p. 43 (1873). Size medium. General colour dull chestnut-rufous, with a black dorsal band. Face rufous, darker down the centre ; crest mixed rufous and black. Nape browner. Dorsal stripe commencing in front of the withers, not pure black, but grizzled with rufous, and not at all sharply defined laterally. Posteriorly, however, on the tail it becomes abruptly very narrow and sharply defined, not covering the whole breadth of the tail, but bordered on each side with rufous or white. End of tail with a large mixed black and white tuft. Under surface of body from chin to anus, inner sides of forearms and hips, and also a line passing down the anterior side of the metatarsi, whitish or pure white; no trace of a darker sternal patch. Posterior faces of buttocks also pure white, very different from the deep chestnut of this part in C. dorsalis. Horns of type (apparently 5 ) conical, sharply pointed. Skull, so far as can be gathered from a young and very imperfect example, with a slender narrow muzzle like that of C. dorsalis castaneus, quite unlike the short conical one of C. d. typicus. Dimensions of the type, an immature specimen with the milk-premolars still in position, and m3 still below the bone:-Height at withers 400 ; ear 65 ; hind foot 203. Skull, breadth of m 1 at cingulum 10*1. Hab. Gaboon [Du Chaillu (Brit. Mus.)]. 7. CEPHALOLOPHUS DORSALIS, Gray. a. Subsp. TYPICUS. Cephalophus dorsalis, Gray, Ann. Mag. N. H. (1) xviii. p. 165 (1846). Cephalophus badius, Gray, Cat. Ung. 1852, p. 85. Cephalophus breviceps, Gray, P. Z. S. 1866, p. 202. Size medium. Ears extremely short and broad. General colour bright chestnut-rufous, with a dark mesial stripe running from the nose to the tail, only interrupted at the crest, which is sometimes rufous. Centre line of face brown ; superciliary streaks bright rufous. Crest variable, either black, mixed black and rufous, or wholly rufous. Dorsal stripe becoming absolutely black on the |