REHN AND HEBARD 255 



When compared with its nearest relative, C. fasdatus, the pres- 

 ent species is found to differ in the more robust form, wider 

 vertex, larger (normal) eyes, differently shaped lateral lobes of 

 the pronotum and very narrow convex callosity of the same, 

 immaculate abdomen with distal portion pale yellow (in males 

 this coloration including the cerci and showing in this respect a 

 greater similarity to C. cinereus), heavier and decidedly longer 

 cerci with straight distal portion broader and very tlecidedly 

 depressed for a much greater distance, ventro-external margins 

 of the caudal femora bearing normally a number of heavier 

 spines and ovipositor which is heavier and differs in outline from 

 all other American species in being noticeably widest meso-distad. 



Vertex weakly ascending. Fastigium of vertex as wide as 

 l)roximal antennal joint, narrowing with a decided concavity to 

 facial suture, when seen from front about one and one-third 

 times as deep as wide. Lateral lobes of pronotum deep, cephalic 

 margin straight, ventro-cephalic angle l)roadly rounded, ventral 

 margin straight and oblique to the sharply rounded ventro-caudal 

 angle, caudal margin sinuous and nearly perpendicular to the dis- 

 tinct hum(M-al sinus. Cereal tooth much as in fasciatus Init sit- 

 uated relatively proximad, this due to the elongation of the mesal 

 and distal portions of the cercus in the present species. The 

 genicular lobes of the caudal femora are normally bispinose; the 

 genicular areas are not darkened; the ventro-external margins of 

 the caudal femora are armed in the eight perfect specimens from 

 lower California before us as follows: 



Numl)er of spines, 2 2 2-3 2-4 3 3 3-4 4-4 4-G 



Number of specimens, 1 1 1 1 2'^' 1 1 



The above material agrees fully with the types except that the 

 specimens average in all proportions somewhat larger. The 

 single specinuMi, recorded below from Costa Rica, is perfectly 

 typical except that the ventro-external margins of the caudal 

 femora are unarmed. 



'^ One of these specimens bears a single si)ine on one of the venlro-inteinal 

 niartrins of the caudal femora. 



TH.^NS. AM. ENT. SOC, XLI. 



