No. 22.] HYMENOPTERA OF CONNECTICUT. 251 



67. Fore wings with an areolet, cubitodiscoidal vein rarely 



branched; metapleurae not projecting tooth-like over hind 



coxae 67 



Fore wings without an areolet or with areolet incomplete; 

 mid femora without teeth, hind trochanters without a 

 tooth beneath 75 



68. Areolet very irregular, oblique, not rhombic 69 



Areolet regular and almost rhombic; second and third dor- 

 sal abdominal segments without oblique impressions .... 



Rhimphalea p. 296 



69. Second dorsal abdominal segment without thyridia and with 



a carina not extending to spiracle; propodeum more or less 



areolated; nervellus branched 7 



Second dorsal abdominal segment with distinct thyridia at 

 base 72 



70. Nervellus branched at or below middle; propodeum not com- 



pletely areolated; clypeus separated at base by an elevated 

 margin; a sharp ridge extending from spiracles to apex of 



basal dorsal abdominal segment 71 



Nervellus branched above middle; clypeus plainly separated 

 at base by an elevated margin Otlophorus p. 295 



71. Antenna swollen above middle, and with its segments 



broader than long and verticillate at apex 



Provancherella p. 295 

 Antenna slender, not strongly verticillate; petiole of abdomen 

 longer than broad Synoecetes p. 295 



72. Clypeus distinctly divided by a nearly median elevation, 



anterior half somewhat flattened and somewhat sloping, 



usually of a different color from the base 73 



Clypeus without a distinct transverse median ridge; nervellus 

 broken at or below middle; mandibles distinctly toothed 

 at apex; areolet distinctly petiolate; third dorsal abdom- 

 inal segment not distinctly longer than wide; mesopleurae 

 without a posterior projecting tooth, propodeum more or 

 less areolated, but not entirely so; clypeus neither com- 

 pressed so that it projects like a tooth in the middle nor 

 forming a flat triangle; first dorsal abdominal segment with 



two keel-like carinse which extend beyond spiracles 



Dialges p. 293 



73. Front without a distinct tooth 74 



Front above antennae with a strong tooth, face elongate, pro- 

 jecting tooth not or but slightly concave, clypeal grooves 

 not beset with long hairs Cosmoconus p. 294 



74. Propodeum not regularly areolated, but with carinae, and 



polished; transverse carinae wanting, longitudinal carinae 



distinct and sharp Quadrigana p. 294 



Propodeum more or less perfectly areolated; edge of anten- 



