NO. 1481. LIST OF PARAGUAYAN LOCUSTS— BRUNER. 641 



c<: Wing with that portion just back of the vein which divides the first and 

 second parts not dilated nor provided witli transverse parallel veins. 

 Fastigium of .the vertex rounded and fading into the frontal costa. 



DipontJnis Stal 

 an. Posterior tibiae with the apical spine absent from the upper outer margin. 

 /'. Posterior tibiae more or less flattened toward the apex, the margins acute, 

 c. Mesosternal lobes contiguous nearly throughout in a straight line. (Tegniina 

 acuminate. ) 

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



('. Fastigium of the vertex with a single deep groove. Interocular space of 



the vertex very narrow Leptysma Stal 



ee. Fastigium of the vertex provided with four narrow shallow grooves. 



The interocular space wider Leptysmina Giglio-Tos 



dd. Fastigium of the vertex shorter than the eyes Arnilia Stal 



cc. Mesosternal lobes more or less distant. 

 d. Pronotum with its hind margin rounded. 



e. Prosternal tubercle tran.sverse, broad, the ajjcx truncate. (Frontal costa 

 complete, gently sulcate, the lateral carinie acute. Facial carinse 

 strongly converging below. Lower edge of sides of pronotum straight. ) 



OxyhIej)leUa Giglio-Tos 

 ee. Prosternal tubercle conical, somewhat acute. 



/. Body graceful. Front strongly oblique. Head much exserted, conical. 

 Antennae distinctly ensiform. Eyes greatly elongate, viewed from 

 above strongly convergent, forming an acute angle. Pronotum dis- 

 tinctly dilated posteriorly, the lower edges of side oblique, straight 



or nearly so. Elytra dilated toward their apex Inusia Giglio-Tos 



ff. Body heavier. Front less strongly oblique. Head less exserted, not 

 conical. Antennae filiform or weakly subensiform. PJyes not or l)ut 

 little elongate, viewed from above gently convergent, forming an 

 obtuse angle. Pronotum but little or not at all dilated posteriorly, 

 the lower edge of lateral lobes on the posterior half straight, on the 

 anterior half emarginate. Tegmina narrowed toward the apex. 

 Pronotum' cylindrical. Frontal costa below the ocellus and lateral 



carinae of the face subobsolete Stenopola Stal 



dd. Pronotum with its hind margin obtusangulate, the apex not incised. 

 Tegmina greatly surpassing the tip of hind femora. 

 e. Frontal costa between the antennae more prominent, subdilated. Eyes 

 more convergent and farther removed from the front edge of the 



pronotum. Tegmina subacuminate Cornops Scudder 



ee. Frontal costa less prominent, and not dilated between the antennae. 

 Ej'es less divergent, and nearer to front edge of the pronotum. Apex 



of the tegmina distinctly rounded Pamcornops Giglio-Tos 



bb. Posterior tibite terete, not laminate, the margins rounded, 

 c. Posterior tarsi with the first and second joints subequal in length. Fastigium 

 of the vertex horizontal or subhorizontal, somewhat jjrominent. The front 

 strongly oblique. Tegmina as long or loHger than abdomen. Pronotum 



subcy lindrical Bucephalacris Giglio-Tos 



cc. Posterior tarsi with the second joint distinctly shorter than the first. 



d. Fastigium of the vertex triangular or in front truncate, divi<led from the 

 frontal costa l)y a transverse carina or distinct angle. 

 e. Upper carina of hind femora smooth, at most provided with punctures 

 from which emanate stiff hairs. 

 /. Interval between the mesosternal lobes narrower than the lobes them- 

 selves, distinctly longer than wide. 



Proc. N. M. vol. XXX— 06 41 



