REHN AXD HEBARD 271 



with certainty males of the species), length and degree of weak 

 curvature or straightness of the ovipositor, coloration of the 

 genicular areas of the caudal femora and armament of the ventro- 

 external margins of the same. Even in the armament of the 

 ventro-cephalic margins of the cephalic and median tibiae, three 

 specimens from Dominica and Trinidad have seven instead of the 

 normal six spines, a condition elsewhere found in the American 

 species only in C. angustifrons, in which form it apparently 

 always occurs. It would seem that several species or at least 

 geographic races must exist, but this is certainly not the case. 

 Certain variations, it is true, are found to be the usual condition 

 over certain regions, but these are not fixed, and the same varia- 

 tion can almost invariably be found in other more t^'pical series; 

 often two series of the most distinctive appearing variations are 

 from the same locality and we are inclined to believe that immedi- 

 ate environment has as much or more to do with the majority of 

 such differences as geographic influences. 



The species has been compared with its nearest ally, ('. equa- 

 torialis, under that species. 



As the species is nowhere fully described we here give the char- 

 acters for a typical male and female as a basis for further discus- 

 sion of the characters and variations of the species. 



Bartica, British Guiana, I, 10, 1913, (H. S. Parish), [A. X. S. P.]. Size 

 medium, form moderately slender. Vertex not strongly but distinctly ascend- 

 ing. Fastigium of vertex moderately broad, greatest width two-thirds that of 

 proximal antennal joint, when seen from front about twice as deep as broad, 

 narrowing with a weak concavity to facial suture. Exes moderately hirge 

 and but shghtly protruding. Lateral lobes of pronotum with cephalic margin 

 broadly arcuate to the ventro-caudal angle with the ventro-cejihalic angle very 

 weakly indicated, ventro-caudal angle sharply rounded (distinctly less than a 

 right angle), caudal margin almost straight (nearly imperceptibly subsinuate), 

 humeral sinus subobsolete, convex callosity very narrow (often sulxibsolete). 

 Tegmina elongate, moderately broad, narrowing evenly to the rather sharjjly 

 rounded apex; male tegminal tympanum not large, weakly longitudinal, 

 stridulating vein not unusually elongate. Male cerci decidedly elongate, 

 proximal portion stout, widening strongly and briefly swollen so as to over- 

 hang a small ventro-internal tooth, which is situated at the proximal base of 

 the mesal portion and directed meso-proximad with the sharp apex strongly 

 decurved, from near the base of this tooth to the apex of the cercus the entire 

 cercus (excepting the proximo-external portion) is very greatly ilepresseil, 

 slanting strongly toward the internal margin, this elongate portion is not in a 

 line with the base of the cercus but is directed moderately ovitward so that the 



TR.\N-S. .\.M. ENT. SOC, XLI. 



