The change of shape of the horns in the Antelopes as the animals grow older, so frequently referred to in this work, is well marked in the present species, and we have therefore thought it worth while to illustrate these differences by figures (figs. 41 and 42). Figure 41 represents the horns of a young, or rather just adult, male, in which they have attained a length of about 6¼ inches, and are evenly curved upwards to their slender points. Figure 42 shows those of an aged specimen, in which it will be seen that the sharp slender point has got more worn down, while at the same time a long straight basal portion has been added below. This change causes such a difference in the general appearance of the horns that authors have in many cases been led to suppose that the extremes represent different species. We therefore take the opportunity of pointing out how deceptive such appearances are, and how careful writers should be when they found species mainly on the characters presented by the horns. At the same time, the perfect identity of the curves in the part that is common to both specimens is very noteworthy, and shows how valuable horn-characters may be when skill and care are exercised in using them. Our figure of this Antelope (Plate XLV.) has been taken by the kind permission of Mr. W. L. Sclater from a specimen of this species belonging to the South-African Museum at Cape Town, which had been sent home to Mr. Edward Gerrard of Camden Town to be mounted. It is an adult male and was obtained by Dr. D. R. Kannemeyer near Burghersdorp in the Cape Colony on the 28th May, 1894. The specimen stands about 27½ inches high at the shoulders, and the body from the nape to the rump measures about 29 inches. The tail is very bushy, and measures at least 9 inches to the end of the hairs. The bare spot beneath the ear is very observable. The general colour of the specimen is well shown in Mr. Smit’s figure. _February, 1897._ 74. CHANLER’S REEDBUCK. CERVICAPRA CHANLERI, ROTHSCH. _Cervicapra chanleri_, =Rothschild=, Nov. Zool. ii. p. 53 (1895); =Chanler=, Through Jungle and Desert, p. 431 (cum tab.) (1896); =Ward=, Horn Meas. (2) p. 137 (1896). Apparently similar to _C. fulvorufula_ in all important respects. A dark stripe present on the top of the nose, similar to that often found in _C. arundinum_ and _C. fulvorufula_. Skull and horns exactly like those of _C. fulvorufula_. Dimensions of the typical skull, taken from a cast:--Basal length 7·65 inches, greatest breadth 3·9, orbit to tip of muzzle 4·8. _Hab._ British East Africa, mountains east of Mount Kenia.