[Illustration: Fig. 15 _c_. Horns of young Gnu (19 months old). (P. Z. S. 1889, p. 3.)] The females of the Gnu, according to Mr. Blaauw’s observation, are very prolific. They begin to breed before they are two years old, and bear a calf regularly nearly every fifteen months. They seem to stand the damp and cold of the Dutch climate without the slightest difficulty. It would even appear that they are specially suitable to domestication, as the animals born in captivity exceed on an average the size of those freshly imported from South Africa. The White-tailed Gnu is only represented in the National Collection at the British Museum by a single immature female, mounted, and not now in good condition, besides several skulls and horns. A good wild-killed specimen of it, were it possible to obtain such an animal, would be, therefore, very acceptable. _January, 1895._ SUBFAMILY II. _CEPHALOPHINÆ._ _General Characters._--Size medium or small. Muzzle naked. Large anteorbital glands present, more or less elongated. Tail medium. False hoofs present. No knee-brushes[10]. Mammæ 4. Skull with large anteorbital fossæ, and with the frontal bones projecting backwards between the parietals, the horns (where 4, the posterior pair) placed on the tips of the projections. Molar teeth square and low-crowned. Horns 2 (exceptionally 4), short, straight; generally present in both sexes, but those of the female more slender and smoother than those of the male. _Range of Subfamily._ Africa and India, not extending over the intermediate regions of Arabia and Persia. This Subfamily contains two genera, as follows:-- 1. CEPHALOPHUS. African; with two horns only, and with the opening of the anteorbital glands forming a long naked line on the sides of the muzzle. Females generally horned. 2. TETRACEROS. Indian; with four horns, at least in the typical variety, and with the opening of the anteorbital glands forming a deep slit in the sides of the muzzle. Females hornless. GENUS I. CEPHALOPHUS. Type. _Cephalophus_, =H. Sm.= Griff. An. K. v. p. 344 (1827) C. SYLVICULTURIX. _Cephalolophus_ (emend.), =Wagner=, =Giebel=, and others C. SYLVICULTURIX. _Sylvicapra_, =Ogilb.= P. Z. S. 1836, p. 138 C. GRIMMI. _Grimmia_, =Laurill.= Dict. Univ. d’H. N. i. p. 623 (1839) C. RUFILATUS. _Cephalophorus_, =Gray=, List Mamm. B. M. p. 162 (1843) C. GRIMMI. _Guevei_, =Gray=, Cat. Ung. B. M. p. 86 (1853) C. MAXWELLI. _Terpone_, =Gray=, P. Z. S. 1871, p. 592 C. SYLVICULTURIX. _Potamotragus_, =Gray=, Cat. Rum. B. M. p. 24 (1872) C. SYLVICULTURIX.