No. 22.] HYMENOPTERA OF CONNECTICUT. 703 



6. Ventral abdominal segments not rigid or retracted, dark, 



except sometimes middle ones; tibiae pale, at least at base 



and apex 12 



First three ventral abdominal segments rigid, bright green, 

 others dark, retracted; tibiae green; second abdominal seg- 

 ment shining, sparsely punctate, hardly ciliate . . .virdissimus 



7. Clypeus convex 19 



Clypeus flat cephalicus 



8. Body black; femora black 9 



Body dull greenish; legs yellow provancheri 



9. Flagel entirely black lerouxi 



Flagel black above, yellow beneath ligatus 



ID. Abdomen with six yellow Sands 11 



Abdomen with five yellow bands; fourth ventral abdominal 

 segment entire virescens 



11. Hind metatarsi carinate; base of abdomen reddish in middle 



splendens 

 Hind metatarsi not carinate; base of abdomen black in middle 



radiatus 



12. Fourth ventral abdominal segment emarginate, not greenish 13 

 Fourth ventral abdominal segment not emarginate, greenish 



purus 



13. Body green, tibiae mostly dark confusus 



Body brassy, tibiae almost entirely stramineous persixnilis 



14. Fourth antennal joint hardly longer than third 15 



Fourth antennal joint longer than second and third com- 

 bined 17 



15. Anterior portion of clypeus dark; legs entirely dark 16 



Anterior portion of clypeus whitish; legs partly whitish.... 



quadrimaculatus 



16. Propodeal enclosure semicircular pectoralis 



Propodeal enclosure triangular nelumbonis 



17. Propodeum coarsely rugose 18 



Propodeum finely rugose foxi 



18. First dorsal abdominal segment distinctly punctate ..... arcuatus 

 First dorsal abdominal segment almost impunctate truncatus 



19. Tegulae punctate 20 



Tegulae not punctate 21 



20. Propodeal enclosure semicircular; wings whitish, .nymphaearum 

 Propodeal enclosure wanting; wings not whitish tegularis 



21. Abdomen greenish or bluish 22 



Abdomen neither greenish nor bluish 26 



22. Mesonotum finely rugose, not shining, closely punctate.. 23 

 Mesonotum smooth and shining, finely and sparsely punctate; 



facial line hardly longer than transfacial line 25 



23. Facial line much longer than transfacial line; apex of clypeus 



usually yellowish; abdomen distinctly greenish 24 



