the Old World Cyrtacant/iacrini. 485 



well as on some of the Atlantic Islands — Cape Verde, Grand 

 Canary, Ascension (B.M.). The existinj^ records of its 

 occnrrcnce also in Sontli America are considered by me to 

 be erroneous and based on a confusion Avith S. paranensis. 



X. Genus Riiadinacris, nov. 



Small and slender. Antennje fairly thick, somewhat 

 compressed, extending in both sexes well beyond the hind 

 margin of the pronotum. Frontal ridge strongly reelinate, 

 in profile straight, forming a very distinct, though rounded, 

 angle with the fastigium. The fastigium slightly sloping, 

 distinctly longer than broad, somewhat impressed. Eyes 

 large, strongly prominent ; their length equal to the sub- 

 ocular height, or even exceeding it, and more than a half of 

 the horizontal diameter; the distance between the eyes less 

 than their horizontal diameter, and subequal to the width 

 of the frontal ridge between the antennae. Pronotum com- 

 pressed laterally, and distinctly constricted in the prozona ; 

 its surface rugulose ; the median keel low, but fairly thick, 

 smooth, and very deeply cut by the transverse sulci. Pro- 

 sternal spine thick, somewhat inflated apically, straight, or 

 very slightly inclined backwards. Elytra very narrow, with 

 sparse reticulation. Wings narrow, hyaline. Hind femora 

 narrow, but rather thick, with all keels remotely and obtusely 

 serrate. Hind tibiae with 8 outer and 10-11 inner spines. 

 Male cerci compressed, broad, triangular. 



This is certainly a very aberrant genus, but its relation to 

 Sc/iistocerca, suggested by the specific name, owing to the 

 shape of the male cerci, is not very close if other characters 

 are taken into consideration. The genus is monotypic. 



1. Rhadinacris schistocercoides {Brancs.). (Fig. 5 c.) 



1893. Acridium schistocercoides, Braucsik, Jaliresh. Ver. Trencs. Com. 



xv.-xvi. p. 122, pi. xii. fig. 2 a-c. 

 *1907. Acridium schistocercoides, Fiiiot, /. c. p. 310. 

 *]9i6. Cyrtacanthacris schistocercoides, J. Carl, Rev. Suisse Zool. 



vol. xxiv. 110. 6, p. 490. 



The general coloration of this species is somewhat 

 variable, as is mentioned by Fiuot and, especiallv, by 

 J. Carl (//. c). 



Geograpldcal distribution. Madagascar. 



XI. Genus Axacridium, nov. 



Frontal ridge in profile vertical, or practically so, slightly 

 dilated above the ocellum, but narrowed again at the 



