276 PROCEEDINGS OF THE AMERICAN ACADEMY. 



c^ Disk of prouotum half as long again as its posterior breadth, 

 less dilated posteriorly ; tegmina nearly or quite five times as long 

 as broad. 



d^. More compressed forms, with relatively longer legs, slenderer 

 pronotum with deeper lateral lobes, and with the serrations of 

 the margins of the ovipositor more prominent . . 1. texensis. 

 (P. More robust forms, with relatively shorter legs, stouter 

 pronotum, with shallower lateral lobes, and with the serration 

 of the margins of the ovipositor less prominent . 3. curvicauda. 

 Ir. Disk of pronotum with parallel or nearly pai-allel sides. 



c^. Pronotum with very rounded shoulders between lateral lobes 

 and disk ; 5-6 spinules on inner carina of under surface of hind 



femora 4. laticauda. 



c^. Pronotum sharply shouldered where the lateral lobes join the 

 disk ; few or no spinules on the inner carina of under surface of hind 

 femora. , 



d}. Larger and more elongate forms, with slenderer pronotum ; 

 tegmina about five and a half times as long as broad; wings in 

 repose extending beyond tegmina by distinctly more than the 

 length of the pronotum ; hind femora nearly as long as tegmina. 



5. mexicana. 

 d^. Smaller and less elongate forms with stouter pronotum ; 

 tegmina about five times as long as broad ; wings in repose ex- 

 tending beyond tegmina by not more than the length of the pro- 

 notum ; hind femora very much shorter than tegmina. 

 e^. Basal plica of ovipositor not marked with black. 



8. furcifera. 

 e^. Basal plica of ovipositor generally marked with black. 



9. furcata. 

 a^. Ovipositor curved but hardly bent, more than half as long again as 

 pronotum. 



b^. Tegmina much more than 30 mm. long, about five times as long 

 as broad and nearly six times as long as pronotum ; hind femora 

 with several spines on each margin beneath ; ovipositor narrower in 

 middle than toward base, tapering through at least the apical third; 



lateral lobes of pronotum as deep as broad 6. ungidata. 



¥. Tegmina much less than 30 mm. long, less than four times as 

 long as broad and five times as long as pronotum ; lateral lobes of 

 pronotum distinctly broader than deep ; hind femora with a single 

 spine or two on each margin beneath .... 10. septentrionalis. 



