926 MR. n. I. PococK ox the [June 14, 



Tetraceros is usually regarded as belonging to theCephalopliinje. 

 1 do not think, however, that the evidence for this relationship 

 is strong, I'elraceros and Cephaloplius dilier widely in the struc- 

 ture of the feet and of the [)reorl)ital glands ; but Tetraceros 

 approaches Boselaphus in these jiarticulars. The presence of 

 four nianinia', the absence of inguinnl glands, and the size of 

 the niurtie may also be cited as corroborative evidence of this 

 relationship. Most suggestive, too, is the px-esence of white patches 

 on the i)asterns, and sometimes at all events of two white specks 

 on the cheeks in Tetraceros. When I noticed these marks in the 

 living animal, before a dead one was available for examination, 

 1 felt sure that the affinities of the genus would prove to be with 

 the Tragelaphines, a group in which these markings are extra- 

 ordinarily persistent. I subsequently found that Sir Harry 

 Johnston* had noticed the same coloui'-features in Tetraceros, 

 and pointed out the resemblance the genus presents to the Trage- 

 laphines in those particulars. It is true that the horns of Tetra- 

 ceros ha\e no anterior crest or keel ; nevertheless, they are more 

 like the horns of Boselaphus than the latter are like the s])irally 

 twisted liorns of the African Tragelaphines. 



Genus Boselaphus Blainv. 



Boselaphus tragocamelus Pall. (The Xylghaie.) 

 (Text-figs. 120, 121.) 



According to Owen, this species has inguinal glands ; Ogilby, 

 on the contrary, says they are absent. The two authors agree, 

 however, as to the presence of preorbital glands ; and Ogilby adds 

 that there are distinct pedal or inteidigital glands. Blanford 

 supports Ogilby's statements. 



Turner described t the preorlntal gland as a slight pit imme- 

 diately in front of the orbit with a small longitudinal fold of skin 

 in front of it. In the middle of this fold (or flap) of skin '' there 

 is a small round pore, through which exudes a yellowish secretion, 

 furnished by a gland pliieed just underneath. The gland itself 

 is slightly larger than a hazel-nut and is laid upon the surface of 

 the bone without any fossa to receive it." 



In an adidt female example kindly sent to me by the Duke of 

 Bedfoi'd, K.G., I found tlu- }>reorl)ital gland marked externally 

 by a short longitudinal slit some di.stance in front of the eye, the 

 area round the slit and between it and the corner of the eye being 

 practically naked. When opened, this slit was seen to be the 

 orifice of a shallow elliptical depression containing some dried 

 waxy secretion. Near the centre of the depression, but varying 

 in position on the two sides, was a conspicuous circular hair-follicle 

 with a hair protruding from it. Tliere were also one or two 



• ' Liberia,' ii. p. 738, 1906. 

 t P. Z.S. 1851, p. 116. 



