South African Grasshoppers. 377 



sppcimen labelled by I. Bolivar as the cotype of Ph. viitata, 

 "which enables me to give a description of it below. 



In the first place, however, I may make some remarks on 

 the genus Phorenula. In I. Bolivar's opinion, the principal 

 distinction between this genus and Prostethoiihymn is in 

 the structure of the temporal foveolje, which are supposed 

 to be well developed, impressed, and perfectly marginated in 

 Phorenula, and imperfectly, or not all marginated, shallow 

 and punctured in Prostetliophyma. My study of a rather 

 long series of Prostethophyma cephalica, Bol., which is the 

 type of the genus Prostethophyma and of Pr. minor, sp. n., 

 enables me to conclude that this character is far from bein"; 

 constant in these species, not even being reliable as a 

 specific character, and therefore quite useless for separating 

 the genera. There remains, therefore, only one character 

 for separating Phorenula from Prostethophyma, and that is 

 in the venation of the elytra, especially in the shape of the 

 discoidal area, which is equally wide throughout in Phorenula 

 and narrowed apically in Prostethophyma ; the difference is 

 a very striking one in the case of the males, but the females 

 of the two genera are extremely alike, and the question 

 arises whether the genera Phorenula and Prostethophy^na 

 should not be better united. T prefer, however, to keep them 

 separate in the meantime, till more species are made known 

 (and I am sure that this group is represented in Soutli 

 Africa by a far greater number of species than is at present 

 recorded), and especially because I have not yet had the 

 opportunity of studying the genotype of Phorenula, for 

 which I should take Ph. dorsata, Bol., as the first of the two 

 species described under this genus. 



4. Phorenula vittata, sp. n. 



1911. Phorennla vittata, I. Bol. in Hit., M6m. Soc. Ent. Belff. xix. 

 p. 82. 



(^ . Rather small for the genus, distinctly compressed 

 laterally. Antennae scarcely longer than the head and pro- 

 notum together, rather thick. Head strongly recliuate. 

 Frontal ridge rather broad, parallel, feebly narrowed at the 

 fastigium, where it is distinctly convex, Avhile elsewhere it is 

 flat, with the margins obtuse, not reaching the clypeus ; 

 surface of the ridge not densely punctured. Fastigium of 

 the vertex perfectly rounded, slightly impressed, with a 

 median keel beginning from its middle and running across 

 the occiput, but not reaching the pronotum ; the lateral 



