414 MR. O. THOMAS ON THE ANTELOPES [May 17, 



subject. Ill the same author's ' Knowsley Menagerie ' figures of 

 the majority of the species will also be found. 



The genus Cephalolophus is a remarkably uniform one, the 

 species, while widely differing in size, colour, and otlier superficial 

 characters, agreeing exceedingly closely with one another iu all the 

 more essential features. I have therefore no hesitation in placing 

 them all under one single generic heading, with the synonymy as 

 follows : — 



Cephalolophus '. 



Type. 

 Cephalophus, Ham.-Sm. Griff. Cuv. An. K. v. 



p. 344 (1827) O. sylvicultor. 



Cephalolophus (emend.), Wagner, Giebel, and 



other German authors C sylvicultor. 



Sylvicapra, Ogilb. P. Z. S. 1836, p. 138 C. griminii. 



Cephalophorus, Gray, List Mamm. B. M. p. 162 



(1843) ■ . . C. grimmii. 



Grimmia, Gray, P. Z. S. 1871, p. 589 C. grimmii. 



Terpone, Gray, P. Z. S. 1871, p. 592 C. sylvicultor. 



Potamoiragus, Gray, Cat. Rum. B. M. p. 24 



(1872) C. sylvicultor. 



Of this genus 18 species appear to deserve recognition, and of 

 these the following is a synopsis : — 



A. Horus, when present, pointed directly backwards, in a 

 line with, or below the line of, the nasal profile. Horns 

 generally present in female. Ears moderate or short, 

 rounded, their length much less than tlie distance from 

 the eye to the nose. General coloiu* fidvous, red, 

 grey, or black, generally marked or striped. 

 a. Size large : hind foot (without hoof) more than 280 

 mm. ; basal length of skull more than 240. 



' See also the two following species, the position of which I have not been 

 able to determine with certainty : — 



(1) Antilope quadriscopa, Ham. Sm. Grifl'. Cuv. An. K. iv. p. 261, pi. (animal) 

 (1827). 



Hab. Senegal. 



The general appearance of this animal is more that of a Gazelle than a 

 Cephalolophus, but the " narrow dark streak, not open but naked, between 

 the eye and the nose " would seem to sho\v that it is a member of the 

 present genus. Its remarkable character of tufts on all the four limbs is 

 rendered less improbable by the recent discovei-y of the heel-tufts in C. dome 

 {infra, p. 424). 



(2) Cephalolophus ruficrista, Socage, P. Z. S. 1878, p. 744. 

 Hab. W. Africa ; probably Angola. 



Only known from the head, which is like in general appearance to that of 

 C. nigcr, but is decidedly larger. 



Horns rounded, but little roughened at base, placed in the line of the face. 



2) M«<;«sio?>s.— Occiput to tip of muzzle 260 mm. ; eye to muzzle 140; length 

 of horns 100. 



