SUBFAMILY III. LOCUSTINJE. 307 



674), described from South Carolina, is a Mexican sp<vk>s 4r '; Ser- 

 vi lie's type, as pointed out by R. & H. (1916, 194), having been 

 probably based on a wrongly labelled specimen. 



Tribe II. LEPTYSMI. 



Very slender, snbcylindrical species, possessing the characters 

 given in the tribal key and having the vertex very narrow between 

 the eyes; disk of pronotum rounded, its median carina faint or 

 wanting, hind margin broadly rounded; tegmina exceeding the 

 abdomen, their tips acute ; mesosternal lobes as wide as long, their 

 inner margin rounded; hind tibiie slightly widened toward apex, 

 their outer margins acute. Two genera represent the tribe in 

 North America. 



KEY TO GEXERA OF NORTH AMERICAN LEPTYSMI. 



a. Head as long as or longer than pronotum; fastigium of vertex as long 

 as the eyes and with a deep median groove; face coarsely punctate. 



I. LEPTYSMA. 



eta. Head shorter than pronotum; fastigium shorter than eyes and with- 

 out a median groove; face almost smooth. II. STENACRIS. 



I. LEPTYSMA Stal, 1873, 42. (Gr., "slender.") 



Slender, subcylindrical species, having the fastigium promi- 

 nent, horizontal, projected in front of eyes in the form of an equi- 

 lateral triangle, the sides low, but distinct; frontal costa low, a 

 little narrowed between the ocellus, shallowly sulcate through- 

 out; eyes longer than wide, set very obliquely on the head; an- 

 tennae shorter than head and prouotum, strongly tapering; pro- 

 uotum almost cylindrical, the metazona a little the wider, front 

 margin truncate; median carina subobsolete, obvious only on the 

 metazona, lateral cariuae wanting; lateral lobes longer than deep, 

 their front margin oblique, hind one slightly concave, lower one 

 subsinuate ; prosternal spine short, its tip obtusely rounded ; teg- 

 mina fully developed, the apical third gradually narrowed ; hind 

 femora very slender, slightly shorter than abdomen in both sexes ; 

 cerci of male slender, tapering, bent abruptly upward and for- 

 ward near base; subgenital plate narrow, upturned, tapering to a 

 point; upper valves of ovipositor much longer than lower ones, 

 their dorsal margins with a row of prominent teeth. An Ameri- 

 can genus, nine species being recognized by Kirby (1910, 410), 

 one from the United States, the others from Mexico and South 

 America. 

 132. LEPTYSMA MARGINICOLLIS (Serville), 1839, 591. Slender Locust. 



Ground color of living specimens usually light yellowish-brown or 

 fawn, unbroken except by a narrow, yellowish stripe extending from the 



"Numerous specimens are in the writer's collection from Orizaba, Mexico. 



