the Old World Cyvtacanthacrini. 489 



(Finot, /. c), Marudaimalai and Coiml)atorc (Bolivar, Rev. 

 K. Acad. Cieii. ^ladrid, xvi. iios. 6, 7, ^>, 9, [). 401, 1918) iu 

 Soutli India, and Ccvlon (13. M.). 



XII. Genus Orthacanthacris, Karscli. 



189G. Orthacanthacris, Karscb, Stett. Ent. Ztg. Ivii. p. 303. 



This very peculiar genus has never been diagnosed 

 properly, as its author simply mentioned in a note to the 

 description of his Cyrtacanthacris humilicrus the principal 

 differences between the latter and cegyptia, and expressed a 

 suggestion that it belongs probably to a distinct genus 

 which may be called Orthacanthacris. As, however, the 

 genus is easily recognisable by the genotype, the name must 

 be regarded as valid. The generic ditl'erence between 

 ceyyptia and its relatives, on the one hand, and humilicrus, 

 on the other, are obvious and clearly indicated in my key to 

 the genera (see Part I., p. 141). 



Kirby's conception of the genus Orthacanthacris (Cat. 

 p. 444 ; Fauna Brit. Ind., Acr. p. 224) is based not on the 

 true generic characters, but merely on the name, and he 

 included in it all the species of Cyrtacanthacrini with the 

 straight prosternal spine ; I have shown already that this 

 character alone cannot be used for separating genera. 



The genotype, . humilicrus , seems to be the only know^n 

 species of this genus, though it is not impossible that the 

 insufficiently described C illustrissima, Karsch (Stett. Ent. 

 Ztg. Ivii. p. 297. no. 60), also belongs here. 



1. Orthacanthacris humilicrus (KsiYsch). (Fig. 7 d.) 



1896. Cyrtacanthacris humilicrus, Karsch, Stett. Ent. Ztg. Ivii. p. 301. 



no. 64, fig. 25. 

 1910. 0\j'thacanthacris'] humilicrus, Kirby, Cat. p. 444. no. 5. 



The dimensions of the male (Eritrsea ; M.M.), which 

 Tv\as unknown to Karsch, are as follows : body 49 ; pronotum 

 10 ; elytra 63 ; hind femur 26 mm. 



Geographical distribution. The species is known from the 

 Slave Coast (Karsch, l.c.)\ Dakar, Senegal (P.M.); Ugugo, 

 E. Africa (Karsch, /. c), and Eritrsea (jM.M.) 



XIII. Genus AYillemsea, nov. 



Frontal ridge in profile somewhat reclinate, slightly 

 convex; seen from the front it is very slightly dilated above 

 the ocellum, narrowed again at the fastigium, as well as 

 below the ocellum ; its surface punctured, slightly impressed 

 below the ocellum ; the margins scarcely raised, almost 



Ann, d- May. N. Hist, iSer. 9. Vol. xi. 32 



