BY F. AV. GODING. 87 



2 (3). Prothorax convex, unai'iiied above lateral 



angles; posterior process convex anteri- 

 orly, tectiform and carinate posteriorly, 

 broad at base, leaving free a very 

 narrow part of the sides of scutellum; 

 costal cell extended a little lengthily 



backward Genus Terentius, Stal. 



Pitchy, abdomen and legs yellowish- 



piceous ; sides of chest densely 



gray, silky ; tegmina vitreous, 



obscure at base, apex and costa 



dilute-piceous, radial and toward 



apex of ulnar veins and including 



veins and discoidal cells, blackish T. convexus, Stal. 



3 (2). Prothorax horned above lateral angles; 



costal cell distinctly and very frequently 

 extended far behind radial cell. 



4 (7). Lateral horns of prothorax acute or 



everywhere equally broad, wholly com- 

 pressed, seen from front, apex not at 

 all broadened. 



5 (6). Dorsum of prothorax unarmed in front of 



posterior process and destitute of a 



distinctly elevated acute carina Genus Sertorius, Stal. 



a. Lateral horns represented by conical 



teeth S. australis, Fairm. 



aa. Lateral horns broad, curved, turned 

 upward, posterior angle forming a 

 little prominent tooth S. curvicornis, Stal. 



6 (5). Dorsum of prothorax armed in front of 



posterior process with an erect, com- 

 pressed process, or furnished with an 



acute, distinctly elevated carina Genus Acanthucus, Stal. 



a. Lateral horns turned directly outward. 

 b. Dorsum of prothorax furnished with 



a vertical spine A. trisipin.iferus, Fairm. 



bh. Dorsum of prothorax destitute of a 



vei'tical spine A. bispinus, Stal. 



a«. Lateral horns not turned dii'ectly 

 outward. 



c. Lateral horns turned forward and 

 upward : median carina behind 

 lateral angles elevated in an 

 obtuse angle A. conspercatus, Stal. 



