REHN AND HEBARD 233 



FF. Cerci?i° Form decidedly robust. Eyes distinctly larger. 

 Fastigium of vertex slightly less than two-thirds as broad as prox- 

 imal antennal joint.'' Ventro -external margins of caudal femora 

 armed with four to five spines. borelli (Giglio-Tos) 



DD. Coloration unusually brilliant and distinctive. (Form moderately 

 robust. Convex callosity of lateral lobes very narrow. Cereal tooth 

 dii'ected strongly meso-proximad. 



E. Caudal femora with ventral margins unarmed. Abdomen not 

 unusually colored. (Fastigium of vertex one-half width of proximal 

 antennal joint. Apex of tegmina broadly rounded, truncate. 

 Distal portion of cercus shorter than in versicolor, lateral margins 

 converging to the acute apex.) truncatus (Redtenbacher) 



EE. Caudal femora with ventro-external margins armed. Abdomen 

 conspicuously and remarkably colored. 



F. Fastigium of vertex one-half width of proximal antennal joint. 

 Apex of tegmina (in brachypterous condition as well) sharjjly 

 rounded. Distal portion of cercus elongate with lateral margins 

 weakly irregular but converging very gently and evenly to the 

 rather sharply rounded apex. Caudal femora with ventro-external 

 margins armed with three to five spines. 



versicolor (Redtenbacher) 

 FF. Fastigium of vertex narrow but about two-thirds width of 

 proximal antennal joint. Apex of tegmina broadly rounded, trun- 

 cate. Mesal swollen portion of cercus more ample and decidedly 

 more elongate than in versicolor, distal portion broad and elongate, 

 with lateral margins arcuato-convergent distad to the very sharply 

 rounded apex, thus forming a very narrow got hie arch. 

 Ventro-external margins of caudal femora armed with five to eight 

 spines. ochrotelus new species 



AA. Caudal tibiae armed at distal extremity with five spurs, the interno- 

 dorsal spur being absent. (Cephalic and median tibiae armed with six well 

 spaced spines. Male subgenital plate as in Xiphidiott.) 



(Subgenus Perissacanthus) 

 (Form very slender. Vertex strongly produced, not ascending, fastigium of 

 vertex slightly more than one-half width of proximal antennal joint. Eyes 

 rather small for South American species. Convex callosity of lateral lobes 

 rather narrow. Apex of tegmina broadly rounded, truncate. Cerci suggesting 

 type found in group I of Xiphidion, but distinctive in the characters given in 

 the specific discussion. Ventral margins of caudal femora unarmed.) 



strictoides (Caudell) 



'" Though we have no males of this species before us, we arc convinced, 

 from the original description and the evident close relationship shown by the 

 females, that males of the species have cerci agreeing at least in general form 

 with those of C. saltalor. 



'1 Distinctly narrower than in material of C. salkdor where the ranges of the 

 two coincide. 



TRANS. AM. ENT. SOC, XLI. 



