53 



been thus far known to do damage to cultivated vegetation 



or to grasses growing on the pampas will be mentioned in 



detail under the resjDective species. 



TABLE FOR SEPARATING THE GENERA. 



A. Posterior Tibirt' provided with an apical spine above iu both margins, 

 b. Fastigium of the vertex horizontally greatly produced. 

 c. Crest of the pronotum serrate throughout. 



PKIONOLOPHA Stal 

 cc. Crest of the pronotum not serrate or sometimes posteriorih' 

 erenulate, or sometimes cut by the transverse sulci, 

 d. Lateral carina* of the pronotum converging toward the front, 

 e. Carinte of the frontal costa pai'allel or gently diverging above 

 the oee lus. 

 f. Tegmina and wings complete, erpialing or surpassing the 

 abdomen. TKOPlI>()N<)TUS Serv. 



ff. Tegmina and wings abbreviated. 



ALCA3IENES Stal. 

 ee. Carina' of the frontal costa diverging aljove tlie ocellus, 

 dd. Lateral carina- of the pronotum parallel or diverging toward 

 the front. EL.-EOCHLOKA Stal. 



bb. P'astigium of the vertex sloping or depressed. 



c. Wings with that portion just back of the vein which divides the 

 first and second parts dilated and provided with numerous par- 

 allel transverse veins. 

 d. Fastigium of the vertex subtriangularly acuminate. Frontal 

 costa compressed. Pronotum above rounded: lateral carina 

 obliterated in fi-ont of last transverse sulcus, blunt back of it. 



KH<)MALE.\ Burmeister. 

 dd. Fastigium of the vertex obtuse. Frontal costa not compressed 

 or sulcate. 

 e. Median carina of the pronotum not cristate. 



f. Head somewhat smooth. Frontal costa above the antennas 

 obtusely sulcate. ZONIOPODA Stal. 



ff. Head ru'gulose. Frcmtal costa usually continuous to the 

 clypeus", sulcate. CLAKAZELLA Pict. et Sauss. 



e. Median carina of the pronotum elevated into a crest which is 

 interrupted by the sulci. TKOPIDACKIS Scudder. 



cc. Wing with that portion jnstltackof the vein which diviiles the 

 first and second parts not dilated nor provided witli transverse 

 parallel veins. Fastigium of the vertex rounded and fading 

 into the frontal costa. DIPONTIIl'S Stal. 



AA. Posterior tibi:e with the a])ical spine absent from the uppei- outer 

 margin, 

 b. Posterior tibi:e more or less flattened toward the apex, the margins 

 acute, 

 c. Mesosternal lobes contiguous nearly throughont in a straight line. 

 (Tegmina acuminate.) 

 d. Fastigium of the vertex as long or longer than the eyes. 



e. Fastigium of the vertex with a single deep groove. Interoc- 

 ular space of the vertex verv narrow. 



LEI»TVS3I.V Stal 

 ee. Fastigium of the vertex provided wltii four nai-row shallow 

 grooves. The interocnlar space wider. 



LEPTVS31INA (iiglio-Tos. 



