960 



MR. R. LYDEKKER ON 



this. Moreover, the palate is more decidedly vaulted in the 

 Somali than in the East African skull. So far as I can ascertain, 

 these differences appear to be constant in all the skulls available 

 for comparison. 



The differences in the proportions of the Somali and East 

 African skulls will be apparent from the following table : — 



E. African. Somali. 



Length of upper aspect 22| ins. 23 ins. 



Breadth at orbits 11 9i 



Palatal length 2U 20| 



Zygomatic width 14| 11| 



Length of upper tooth-row (excluding p. 1)... 10^ 10|- 



Widthofm.2 2| 2^ 



As these dimensions amply demonsti-ate the racial distinctness 

 of the two forms, the Somali animal may stand as B. bico?niis 

 somcdiensis Potocki ; the specimen here described occupying the 

 position of type. It may be added that if the East African and 

 Somali skvills were of the same age, the difference in the lengths 

 of the upper tooth-row would be greater. 



II. The Nigerian Klipspringer {Oreotragus scdtator jjorteusi). 

 Lydekker, Abstract P. Z. S. 1911, p. 38 (June 20). 



Early in May, as I have already stated in the Field news- 

 paper for that month, Mr. Rowland Ward directed my attention, 

 to the skull and horns of a male Klipspringer from the Duchi 'n 

 Wai range of the Yola province of Northern Nigeria, lying to 

 the south-wesb of Lake Chad. The skull was taken from an 

 animal shot there by Dr. E. J. Porteus, by whom it was kindly 

 placed at my disposal. KliiDspringers, it appears, are quite 

 familiar to the natives working in the Yola tin-mines, by whom 

 they are known as gaddi-duehi, a term equivalent to Hill Duiker. 



The skull (text-fig. 192) differs from that of an East African 

 Klipspringer by its miich greater width ; its diameter across the 

 orbits being 3^ inches, whereas that of the East African specimen 

 is 2J-| inches. It is further distinguished by the marked bending 

 down of the margin of the lachrymal bone, which consequently 

 has a distinct lateral surface in place of a sharp edge, and also 

 shows only a comparatively small part of its total area from the 

 frontal aspect. 



Klipspringers, so far as I am aware, appear to be unknown on 

 the "West Coast north of Angola* ; while to the north, Abyssinia 

 is the nearest point to Yola where they are found. As the 

 country between the last two districts is to a great extent low 

 desert, the Yola Klipspringer must be quite isolated. 



On this ground, and also on account of the peculiarities in the 

 form of the skull, it is clearly entitled to racial distinction, and 

 I propose to name it Oreotragus scdtator porteusi, in honour of 

 Dr. Porteus. 



* For the information that Klipspringers inhabit Angola, I am indebted to 

 Mr. E. A. Hamilton. 



