THE CANADIAN ENTOMOLOGIST. 179 



distinct spurious vein, or irregularly reticulate, never occupied throughout 

 by a single series of cells. 



b'. Lateral carinse of pronotum arcuate, the disk of unequal width, 

 being narrower, often considerably narrower, in the middle than behind 

 and generally than in front. 



c\ Antenna' of male considerable longer than head and pronotum 



together. 



d\ Disk of pronotum only slightly clepsydra!, the lateral carinse 



diverging but little or not at all in front and not greatly behind ') 



tegmina of male generally but little if at all surpassing the hind 



femora salina. 



d\ Disk of pronotum considerably clepsydral, the lateral carinje 

 diverging noticeably both in front and behind, but especially 

 behind ; tegmina of male generally considerably surpassing the 



hind femora pratorutn- 



r. Antennte of male no longer or scarcely longer than head and 

 pronotum together. 



d\ Fastigium of vertex generally rectangulate in front ; disk of 

 pronotum distinctly clepsydral, the lateral carince distinctly and 

 often considerably divergent both in front and behind ; ulnar area 

 of tegmina, even in the male, but little wider than the discoidal 



area pelidna. 



d\ Fastigium of vertex usually acutangulate in front; disk of pro- 

 notum feebly clepsydral, the lateral carina? scarcely ornot diverging 

 in front and not greatly behind; ulnar area of tegmina, especially 



in the male, distinctly wider than the discoidal area oUvacea. 



Ir. Lateral carinas of pronotum subparallel, so that the disk is of 

 subequal width throughout. 



c\ Antenna- of female no longer or scarcely longer than the pro- 

 notum, distinctly flattened ; face little oblique viridescens. 



c\ Antennae of female distinctly longer than the pronotum, cylindri- 

 cal ; face considerably oblique Scuddcri. 



Having seen no specimens of O. orizabce McNeill, I am unable to 

 give it a place in the table, but it will fall in the close vicinity of 0. 

 tepaiieca. 



