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



1. Cephalolophtjs sylvicultor, Afz. 



Antilope sylvicultrix, Afz. N. Act. Ups. vii. p. 265 (1811). 



Cephalophus longiceps, Gray, P. Z. S. 1865, p. 204 (woodcut of 

 skull). 



Cephalophus melanoprymnus, Gray, P. Z. S. 1871, p. 594 

 (woodcut of skull), pi. xliv. (animal). Juv. 



Size large ; form stout and heavy. Ears short, broad and rounded, 

 their length much less than the distance from eye to muzzle. Fur 

 very short on the fore-quarters, longer on the hind hack, but in 

 adults worn off and showing the whitish underfur or naked skin 

 round the base of the tail. General colour all over, of face, body 

 above and below, and of limbs, dark blackish brown. Muzzle, cheeks 

 and chin, and extreme tips of ears whitish. Lumbar region with a 

 broad pale yellowish mesial stripe running from the middle of the 

 back on to the loins. 



In extreme youth the hairs of the posterior half of the body are 

 all tipped with white, except just along what is afterwards the pale 

 lumbar stripe, where they have long blackish tips, entirely hiding 

 thewliiite; and the caudal region, afterwards whitish and partly 

 naked, is clothed with long black hairs. (See Gray's figure and 

 description of " C. melanoprymnus.") 



Horns long and tapering, lying back in or below the line of the 

 nasal profile, but rather bowed downwards terminally. Divergent, 

 slender, evenly tapering, but little roughened at base : — 



(S and $ almost precisely alike, except that the latter are 

 shghtly smaller. Length ( cJ ) 163 mm. ; basal diameter going 

 about 5 or 5| times in the length. 



Skull, in proportion to the size of the animal, delicate, slender, 

 and elongate. Muzzle slender, tapering, not laterally swollen 

 between the premolars and the anteorbital fossa. Anteorbital 

 fossae of medium depth, their bottoms from 22 to 24 mm. apart \ 

 Mesial notch of palate surpassing anteriorly the lateral ones by some 

 10 or 12 mm., these latter comparatively deep and V-shaped. 

 Bullae without any secondary inflation behind the point where the 

 stylohyal articulates. 



Dimensions.— 2 ■ Height at shoulder 880; ear 105; hind foot 

 345. 



Skull (c?) — basal length 262; greatest breadth 125; anterior 

 rim of orbit to gnathion 166; nasals, length 123, breadth 46; 

 muzzle' 99 ; length of upper molar series 89. 



Hub. West Africa. Sierra Leone (Jfzelius) [Whitfield (Brit. 

 Mus.)] ; Liberia [Schweitzer (Berl. Mus.)] ; Fantee [Aubinn (Brit. 

 Mus.)] ; Lagos [Molonei/ (Brit. Mus. y]; Gaboon [Du Chaillu (Brit. 

 Mus.)]. 



This, the largest species of the genus, is remarkable for the great 

 change of colour which takes place as the young grows up, a change 

 which, although brought about by very simple means, is so great as 



' Measured with calipers across the muzzle. 

 - Front of the anterior premolar to gnathion. 



