196 MESSRS. BRUNNER AND REDTENBACHER ON [Mar. 1.5, 



as for example in the type, unites below the ramus of the mandible 

 into that running down from the ear, those of both sides uniting 

 again on the throat. Throat apparently without a tuft. 



Oryx beisa and O. gazeUa, the only two species at all allied to O. 

 callotis, both have their ears broadly rounded and quite short-haired 

 at the tips, and both have the ground-colonr of the face white, cha- 

 racters which readily separate both of these from the species now 

 described. On the whole O. callotisia more nearly allied to O. beisa, 

 O. gasella being distinguished from both of them by its ihroat-tuft, 

 its larger and more widely expanded horns, and the different cha- 

 racters of its face-markings. 



The type specimen has horns 23| and 22 inches in length, but 

 the horns are frequently much larger. Sir John Willoughby ^ says, 

 " The horns of a female measure from thirty to thirty-two inches ; 

 those of the male are thicker, but a few inches shorter." 



Mr. Thomas expressed the hope that complete specimens of this 

 handsome inhabitant of the Imperial British East African Company's 

 territoi-y would soon be obtained for the National Collection. 



The following papers were read : — 



1. On the Orthoptera of the Island of St. Vincent, West 

 Indies. By C. Brunneb v. Wattenwyl and Professor 



J. REDTENBACHER^ 



[Received February 17, 1892.] 

 (Plates XV.-XVII.) 



At the request of the joint Committee appointed by the British 

 Association and by the Royal Society to investigate the Fauna aud 

 Flora of the West Indian Islands, Herr Hofrath Carl Brunner von 

 Wattenwyl has been so good as to undertake the examination of the 

 Orthoptera obtained in the Island of St. Vincent by Mr. H. H. 

 Smith, the naturalist sent thither by Mr. F. D. Godman, F.R.S., to 

 assist the operations of the Committee. 



Herr Brunner obtained the help of Prof. J. Redtenbacher, and 

 the present memoir gives the result of their study of the material 

 submitted to them. 



Herr Brunner, when sending to me the MS. of this paper, re- 

 quested me to write an introductory notice in our own lano'uawe ; 

 I have complied with his wish with the greater pleasure as giving 

 me an opportunity on behalf of the Committee of publicly thaukiuo- 

 him, as well as Prof. Redtenbacher, for the careful study they 

 have made of these insects. I have also been able to supplement 



' ' East Africa and its Big Game,' p. 288 (1889). 



"^ [Communicated by Dr. D. Sharp, F.R.S., F.Z.S., on behalf of the Com- 

 mittee for investigating the Fauna and Flora of the West Indian Islands.] 



