the Old World Cyrtacanthacrini. 4:77 



that species, and I do not find it possible to retain them in 

 the genus Acriduderes^ as the shape of fastij^ium and ot" the 

 pronotum, as well as the retieulation of the elytra, which is 

 somewhat abnormal for a member of the group Acridoderij 

 are all characters of generic value, and so striking that a 

 detailed description of the genus may be omitted. 



1. Anacridoderes Icevigatiis (Bob). (Fig. 5 6.) 



1911. Acndoderes Jccvic/atuSy Bolivar, Ann. Soc. Ent. Belg. Iv. p. 303. 

 no. 9. 



Owing to a slip, the species is called An. crassus in the 

 explanation of the fig. 5 (Part I., p. 139). 



Geographical distribution. Katanga, Belgian Congo (Boi., 

 I.e.); Pretoria and Johannesburg, Transvaal (B.M.; 3 ? ?). 



IV. Genus Congoa, Bol. 



1911. Conffoa, Bolivar, Ann. Soc. Ent. Belg. Iv. p. 303. 



The genus undoubtedly belongs to the group of Acrido- 

 deri, as the shape of the head and elytra (which are, though 

 abbreviated, distinctly obliquely truncate apically) shows, 

 and it is quite distinct from any other genus of the group. 

 Only one species is known. 



1. Congoa katangce, Bol. 

 **1911. Congoa katangce, Bolivar, /. c. p. 304. no. 10. 



The type, which is the only specimen known, is charcoal- 

 black all over (except on the sides of the abdomen, which 

 are somewhat brownish), and there is no reason to think, as 

 Bolivar does, that this coloration, unusual in Orthoptera 

 though it is, is not natural and due to the bad preservation 

 of the specimen. 



Geographical distribution. Katanga, Congo (Mus. du 

 Congo Beige). 



V. G-enus Pachyacris, nov. 



This new genus forms a kind of link between the true 

 Acridoderi (i. e., the genera Acridoderes, Anacridoderes, 

 Fhyxacra, and Congoa) and the Valanga group of genera, as 

 it agrees with the latter group in the shape of the fastigium, 

 frontal ridge, and apex of elytra, while the reticulation of 

 the apical half of the elytra is very characteristic for Acrido' 

 deri and CoptacriC. 



Two species arc known in this genus, both from the 

 Oriental rcsfion. 



