External Characters of Ruminant Artiodactyla. 429 



In view of the above-recorded facts, the tabulation of the 

 genera of Cephalophinae I published in 1910 (p. 876) may 

 be amplified as follows : — 



a. Inguinal glands absent Gicevei. 



a'. Inguinal glands present. 



b. Inguinal glands consisting of a deep pocket ; urethral 

 canal not prolonged as a slender tube beyond the 

 tip of the glans of the penis ; horns backwardly 



inclined Cephalophus. 



//'. Inguinal glands consisting of a very shallow pocket 

 or gutter-like groove ; urethral canal prolonged as 

 a slender tube beyond the end of the glans of the 

 penis ; horns approaching the vertical Sylvicapra. 



To the characters of the subfamily Cephalophinae must be 

 added the absence of the gall-bladder in the liver. I have 

 failed to find a trace of this structure in any one of the many 

 examples of this group I have examined, thus confirming the 

 statements of others as to the invariable absence of this 

 hepatic sack. 



Subfamily Xeotraginm. 



Of this subfamily I had only seen in 1910 representatives 

 of two genera and species, namely Ourebia nigricaudata and 

 Raphicerus campestris, my acquaintance with the latter being- 

 limited to two dried and mounted skins. Since then I have 

 seen fresh examples of two additional species of Ourebia and 

 of the two genera Nototragus and Neotragus. The two species 

 of Ourebia agree in all essential points with the one previously 

 described, and Nototragus similarly resembles Raphicerus, 

 as might be expected. But Neotragus is in many respects 

 different from the other genera referred to the Neotraginae ; 

 and if subsequent examination of the species supposed to be 

 related to JSeotragus, but assigned to the genera or subgenera 

 Hylarnus and Nesotragus, shows that they are like Neotragus 

 pygmceus in the pedal glands, it may be desirable to sever 

 Ourebia, Raphicerus, and Nototragus from the Neotragince as 

 a separate subfamily, Ourebiinae. 



Genu3 Ourebia, Laurill. 

 Ourebia nigricaudata, Brooke (p. 882). 



A subadult male of this species from Sierra Leone (F. W. F. 

 Jackson) agreed closely with the specimen described in 1910 

 in the structure of the pedal and preorbital glands, the secre- 

 tion from the latter being copious and black. The carpal 



