68 PROCEEDINGS OF THE ACADEMY OF [Feb., 



First segment behind carina broader than long, a broad trans- 

 verse smooth area behind carina ; clypeus sharply emarginate, 



areatics cf- 



7. Abdomen with deep punctures; tegulse reddish; a yellow spot 



under wing, the latter yellowish along costa, 



dentiformis ? d"'. 



Abdomen with fine, much shallower punctures; tegulse black; 



no spot under wing, the latter dark, . . abdominalis ?. 



8. Middle segment without a horizontal surface, .... 9 

 Middle segment with a more or less developed horizontal 



surface, 10 



9. Head and pronotum orange ; all abdominal segments fasciate, 



fulvimaciil'us ? . 

 Head and pronotum red; only two abdominal fascia, 



rnfiviacuhts ? d^. 



10. Vertex not elevated, as usual, 11 



Vertex strongly elevated, strongly tuberculate near the ocelli ; 



first abdominal segment with an additional carina, . . 21 



11. Horizontal surface of middle segment very short, almost want- 



ing medially; form graceful, Polybia-Vike, .... 12 

 Horizontal surface well develoj^ed, 13 



12. Segments 1 and 2 fasciate; second ventral segment trans- 



versely prominent before base, atrij^es ? S . 



All the segments fasciate ; second ventral segment not promi- 

 nent basally, rather evenly convex, . . covjundus $ cJ'. 



13. Second segment distinctly reflexed at apex, . reflexus ? cf'. 

 Second segment not or but slightly reflexed, . . . . 14 



14. Wings yellowish, paler apically; segments broadly fasciate, 



Herhertii ? c?. 



Wings subhyaline, 15 



lo. First abdominal segment without a transverse, depressed area 



behind the carina on each side, 16 



First abdominal segment with a transverse, depressed area 

 behind the carina on each side, 17 



1 6. Clypeus pyriform, bicarinate in ? , these carinse ending in two 



sharp teeth (not carinate in cf, shorter and bidentate); 

 abdomen shining, with strong separated pimctures; scutel- 

 lum not yellow, male coxre dentate above basally, 



coxalis 9 d. 



Clypeus cordate, not carinate, with a not deep triangular emar- 



ginatiou; abdomen subopaque, finely and closely punctui-ed; 



scutellum with yellow line, cordatus ?. 



17. Females, 1<S 



Males, 19 



18. Clypeus convex, punctured, with a strong carina on each side 



ending apically in a tooth; doi"sulum with a yellow spot 

 before scutellum dorsonotatus 9. 



