145 



aa. The dorsum of the prouotuia tlat or obtusely rouuded ; median 

 cariua of the prouotum slight ; lateral carinte somewhat dis- 

 tinct, though obtusely rounded ; abdomen of the male swollen 

 at the extremity : t 



b. Wings usually as loug or longer than the abdomen : 



c. Eyes closely approximate above ; vertex sub-hexagonal ; pro- 



uotum sub-cylindrical Ommatolampis. 



cc. Byes less approximate above; vertex longitudinally channeled ; 



lateral carinas sub-distinct Caloptenus. 



bb. Wings absent or aborted : 



c. Pi'osternal spine truncate at the apex ; lower border of the sides 



of the prouotum ungulate Platijplmma. 



cc. Prostenial spine acute or rounded at the apex ; lower border 



of the sides of the prouotum straight or obtusely rounded Pezotettix, 



PESOTETTIX, Beirm. 

 Fodisma, Latr. Fieb. De Borck. ; Acridium {Podisma), Serv. 



Body medium size ; female narrow posteriorly. Head large ; face per- 

 pendicular, or nearly so ; occiput short, convex ; vertex between the eyes 

 narrow, in front of these short, somewhat deflexed, concave, no lateral foveoloa; 

 frontal costa, lateral carinse, and cheek carinse distinct ; the frontal costa gen- 

 erally convex al)ove the ocellus ; eyes sub-ovate or sub-globose ; aiitennre 

 cylindrical, reaching the tip of the pronotum ; joints somewhat distinct. 

 Pronotum sub-cylindrical, the humeral angles rather more rounded and less 

 distinct than in Caloptenus ; disk sub-convex ; median carina generally oblit- 

 erated on the anterior lobes, more or less distinct on the posterior lobe, sub- 

 truncate in front, truncate or rounded behind, sometimes obtuse-angled, but in 

 the latter instances the posterior lateral margin ascends from the lateral angle 

 to the apex without any entering angle at the humerus ; the three transverse 

 impressions distinct, cutting the median carina; the intermediate one sub- 

 bisinuate ; posterior lobe punctui'ed. Prosternal spine rather short, obtuse ;. 

 pectus broad as the head. Elytra and wings wantiug or abbreviated. Four 

 anterior legs short ; in the male the middle femora much swollen ; posterior 

 femora moderately dilated at the base. Extremity of the male abdomen 

 somewhat swollen and turned up ; cerci generally slender. 



This genus is sometimes divided into sub-generic groups. 



SynoiJtical table of the species. 



A. Without elytra or wings : 



a. Body slender ; lateral carimc obsolete ; median carina very mi- 

 nute ijlaciaUs. 



19 A 



