326 MR. G. BLAINE ON THE ZEBRAS 



Comparative skull measurements in millimetres : — 



B.M. No. Length. Breadth. Nasals. Tooth-row. 



Oribi (Cape) 135« 165 77 53 50 



(approx.). 



Oribi (Rhodesia). 12.5.10.2. 168 72 60 51 



hastata 13.9.5.4. 176 77 65 53 



rutilus 20.4.27.40. 177 75 67 52 



Oribis have peculiar inguinal glfi.nds, and in these Angolan 

 Oribis they were very noticeable. They are covered at the sides 

 by a modiHed pouch, consisting of a pair of flaps of tough pai-ch- 

 menc-like granular skin with serrated edges, sparsely covered 

 with coarse white hairs and enveloping the genital organs of the 

 male and the mammte of the female. The female seems to show 

 a greater development of this curious growth than the male. 



This peculiarity is bi'iefly referred to by Roosevelt in ' African 

 Game Animals,' ii. p. 555. as follows : — " At the groin are a pair 

 of deep inguinal sacs marked by a growth of long peculiar pithy 

 hairs." 



Pocock*, in describing these inguinal glands in Ourebia, gives 

 examples of their variation in the different i^aces of that genus, 

 notably in nigricaudatct-, montana, and ourehi. 



Since my observations of these glands in the case of rutilus 

 differ in some respects from his descriptions, it is probable that 

 this variability is characteristic of the genus. 



SyLVICAPRA GRIMMI LEUCOrROSOPUS. 



0. Neumann, Sitz. Ges. Nat. Freunde, 1899, p. 18. 



In my collection of Antelopes from Angola I brought back- 

 seven specimens of a Grimm's Duiker from the countr}' between 

 the Quanza and Luando Rivers. These have been found to agree 

 best with Herr 0. Neumann's description of his leitcoproso^nis, 

 which he thought might have come from the interior of Angola, and 

 in this supposition he was probably correct. He describes as his 

 type a male living with a female in the Berlin Zoological Gardens. 

 The female he referred to Cephalophus aliifrons ( = octdaris) Peters 

 from Mozambique or to flavescens Lorenz from Matabeleland as 

 being greyish brown in colour with less white on the imder parts. 

 But he gives a very full and careful description of the male, to 

 which the above specimens conform most accurately, and especially 

 touching the masked or spectacled appearance of the face viewed 

 frontally, due to the white rings encircling the eyes. 



There are two skins of S. S2}lendidiilus Gray and also a stuffed 

 specimen in the B. M. collection, all from Angola. They represent 



* P. Z. S. 1910, pp. 882-884 ; also A. M. N. H. 1918, p. 430. 



