1893.] PEOM BRITISH CENTRAL AFRICA. 727 



which are lyrate in shape and bend forward at the apex. These 

 four species are as follows : — 



1. O. eUipsiprymnus'^, which extends from South Africa up the 

 Eastern coast to Somaliland and the While NUe, and may be at 

 once recognized by the elliptical white ring on the rump near the 

 base of the tail. 



2. G. crcnvsTiayi, similar to the preceding, but of a much darker 

 brown, and without the ring on the rump. At present known only 

 from Lake Mweru. 



3. O. defassa. — This is the Antilope defassa (Euepp. Neue Wir- 



Skull and horns of Cobits crawshayi. 



belth. Saug. p. 9, t. in.), so-called from its Abyssinian vernacular 

 name " Defassa," which must therefore not be altered into defassus 

 as has been attempted by some authors. Herr Matschie (Sitzungsb. 

 Ges. naturf. Freund. Berlin, 1892, p. 134) has lately pointed out 

 the differences between this Abyssinian form and the next, nearly 

 allied, West-African species. There are fine mounted specimens 

 of this Antelope in the gallery of the British Museum. 



4. C. unctuosus. — The allied West-African form, of which we 

 frequently have examples living in the Society's Gardens and at 

 the present time have a single female specimen, has been generally 



1 See P. Z. S. 1893, p. 505, pi. xxxis,, for remarks on this species breeding 

 in our Gardens. 



Proo. Zooi. Soc— 1893, No. XLIX. 49 



