No. 22.] HYMENOPTERA OF CONNECTICUT. 725 



21. Fore coxae without spines; a spot on each side of second 



and third dorsal abdominal segments 22 



Fore cox^ with a short spine; pygidium subacute; "yellow 

 fascia on fifth dorsal abdominal segment opaque, .denticulata 



22. Length less than 8 mm g^ j 



Length 10 mm '.*'.'.'.".'.■'.'.'.'.".■■ bisi^ata 



23. First transverse cubitus usually present 24 



First transverse cubitus usually wanting; largely red; second 



to fifth dorsal abdominal segments with yellow fasciae, 

 sometimes interrupted on second obliterata 



24. Mesonotum black; second to fifth dorsal abdominal segments 



with more or less interrupted yellow bands; scutel mostly, 



propodeum partly, yellow f estiva 



Mesonotum with four yellow lines; first to sixth dorsal ab- 

 dominal segments with yellow bands; propodeum with 

 subquadrate marks encroaching upon the enclosure luteola 



25. Seventh dorsal abdominal segment entire 26 



Seventh dorsal abdominal segment notched; third antennal 



joint shorter than fourth 29 



26. Third antennal joint longer than fourth 37 



Third antennal joint shorter than fourth; basal vein inserted 



a little before nervulus; abdomen black, with yellow 

 marks; mostly black proxima 



27. Propodeum with two yellow spots; posterior orbits largely 



yellow 28 



Propodeum and posterior orbits black or nearly so; fifth and 

 sixth dorsal abdominal segments with continuous, second 

 to fourth with interrupted yellow bands; first dorsal ab- 

 dominal segment entirely black; basal vein usually inter- 

 stitial with nervulus placida 



28. Scape obovate; basal vein interstitial with nervulus; flagel 



darker in the middle; scutel sub-bilobed vincta 



Scape ordinary; basal vein inserted before nervulus; flagel 

 darker above; scutel bilobed affabilis 



29. First transverse cubitus usually present 30 



First transverse cubitus usually wanting obliterata 



30. First to sixth dorsal abdominal segments without entire and 



continuous bands, usually with some lateral spots; when 

 continuous the bands have separated spots on extreme 



sides of fifth segment 31 



First to sixth dorsal abdominal segments with entire and 

 continuous bands, sometimes narrowly interrupted on 

 first; basal vein inserted before nervulus; a band on first 

 dorsal abdominal segment continuous; flagel usually dark, 

 piceous beneath, joints cylindrical luteola 



31. Abdomen mainly black 35 



Abdomen chiefly reddish; barsal vein inserted before nervulus 32 



