the Old World C/jrlaC'tntJiacnni. 4S3 



Key to Sj)ecu'.<(. 



1 (2). Fastigium of the vertex longer than broad 



(even in the female), acutely ang-iilate 

 or very uarrowl}' truncate behind. Pro- 

 notuni distinctly compressed laterally, 

 with very coaise impressions and callous 

 rugosities, especially noticeable in the 

 metazona, where they are longitudinal ; 

 its median keel strongly arched. (W. & 

 C. Africa.) 1. tectifem (Karsch). 



2 (1), Fastigium of the vertex not longer than 



broad (even in the male), truncate 

 behind. Pronotum tliick, coarsely punc- 

 tured, -with rugosities in the prozona 

 only ; its median keel low. (S.E. Africa.) 2. pimctata (Kirby). 



1. Rhytidacris tediftra (Karsch). (Fig. 6 Z>.) 



1896. Ci/rtacanthacris tcdiferus, Karsch, Stett. Ent. Ztg. Ivii. p. 299. 

 no. 62, tig. 24. 



G eograpMcal distrihition. Yapi, N. Territories, Gold Coast; 

 Old Calabar (B.M.) ; Karaerun (M.M.) ; Kassoiigo to Stan- 

 ley Falls (M.]\r.) ; Popocabacca (Bl. M.) ; Kondove to 

 Karonga, Nyasaland (B.M.) ; Zomba (B.M.). 



The specimen from Cameroons is very dark brown on 

 the upper side^ while the lateral lobes of the pronotum and 

 mesopleurre are pale^ but it does not differ in structural 

 characters from other specimens, aiul I take it to be just a 

 colour aberration. 



2. Rhytidacris punctata (Kirby). 



♦♦1902. Acridoderes pundains, Kirby, Trans. Ent. Soc. Lond(^n, 

 p. 239. no. lOSc. 



Kirby says that his type is a female, but it is obvious 

 even from his description of the genitalia that it is a male, 

 as the study of the type shows. 



Geographiccd distribution, llustenburg, Transvaal (^Kirby's 

 type ; B.M.) ; Bnltfontein, Pretoria distr. (B.M.) ; Durban 

 (B M.) : Zoutpansberg, Transvaal (M.M.). 



IX. Genus Schistocerca, Stal. 

 This is an essentially New World genus, or rather group 

 of genera, which is rei)rcsent(d in the Central and South 

 America by a large number of species, requiring a thorough 

 revision, as their systematics and synonymy are in a chaotic 

 state. As this paper, however, is restricted to the Old AVorld 

 representatives of the group, we have to deal with a single 

 species only, which is also the type of the genus. 



