27-4 PEOCEEDINGS OF THE AMERICAN ACADEMY. 



e^. Tegmina relatively broad, in the middle (and especially in 

 the female) distinctly broader than the length of the prono- 

 tum ; lateral lobes of pronotum nearly vertical, subacutely 

 separated from the disk by lateral canthi ; depending, com- 

 pressed, securiform basal plate of anal segment of medium 



size 3. curvicauda. 



e^. Tegmina relatively narrow, in the middle distinctly nar- 

 rower than the length of the pronotum ; lateral lobes of prono- 

 tum flaring below, very obtusely separated from the disk, 

 there being no sign of lateral canthi ; depending, compressed, 

 securiform basal plate of anal segment of exceptional size. 



4. laticauda. 

 c^. Anal segment very deeply and narrowly emarginate at apex, 

 the sides of the emargination or fissure parallel or nearly so, the 

 lateral lobes variously developed but generally incrassate, separated 

 by a space too narrow properly to admit the subgenital plate. 



d^. Each lateral half of the expanded apical portion of anal seg- 

 ment about twice or more than twice as long as broad, sub- 

 cylindrical, the deep apical emargination narrow with parallel 

 sides. 



e\ The apical expanded portion of anal segment conspicuously 

 emarginate in the middle, as seen laterally, the apical lateral 

 flanges more or less obliquely compressed and laminate ; hind 

 femora with a few spines beneath on inner margin only. 



5. mexicana. 

 e^. The apical lateral lobes of the anal segment forming sub- 

 cylindrical, subcompressed, and rounded masses, not laterally 

 emarginate ; hind femora spined beneath on both margins. 



f^. Lateral canthi of pronotum subdistinct, at least posteri- 

 orly; subgenital plate conspicuously surpassing the tip of the 

 anal segment, the latter with no lamina depending between 



the cerci at its base 6. ungulata. 



/^ Lateral, canthi of pronotum entirely wanting; anal seg- 

 ment just reaching the apex of the subgenital plate, and with 

 a conspicuous, backward-directed median lamina depending 

 from its base between the cerci, forming a calcariforni pro- 

 cess 7. paronce. 



d^. Apical portion of anal segment forming a cleft unguliform 

 body, very deeply emarginate apically, each lateral half consisting 

 of a swollen mass not greatly longer than broad, the apical emar- 



