No. 22.] HYMENOPTERA OF CONNECTICUT. 73 



22. Head with postocellar area more densely punctate than 



sides of vertex; body black, with median lobe of mesonotum 

 sometimes knees, and abdominal segments one to five, 

 rufous; wings hyaline, veins black, stigma paler below. 



Length 8 mm conjugatus 



Head with the postocellar area and sides of the vertex uni- 

 formly, finely punctate; body black, with abdominal seg- 

 ments one to five and basal half of sixth, rufous; wings 

 hyaline, veins and stigma black. Length lo mm dysporus 



23. Mesonotum with impunctate area on sides of lateral lobes 



not extending to margin of median lobe; head with a fine 

 ridge extending from eye obliquely toward occiput; median 

 lobe of mesonotum more densely punctate than lateral 

 lobes; body black, with the prothorax, tegulse, and abdom- 

 inal segments one to five, rufous; wings very slightly in- 



fuscated, veins and stigma black. Length 8 mm plesius 



Mesonotum with impunctate area on sides of lateral lobes 

 extending broadly to margin of median lobe; head not 

 with a fine ridge extending from eye toward occiput; 

 mesonotum finely, densely punctate; body black, with pro- 

 thorax, tegulse, median lobe of mesonotum, upper half of 

 pleurae, and abdomen except saw-guides, rufous; wings 

 infuscated, veins black. Length 9 mm agcistus 



24. Mesonotum with impunctate area on sides of lateral lobes 



distinct and extending broadly to median lobe 25 



Mesonotum with impunctate area on sides of lateral lobes 

 almost entirely wanting, or, at least always separated from 

 median lobe by a narrow punctate area 26 



25. Antennal furrows subobsolete above base of antennae or 



with minute lateral foveae; body in female blue, with prono- 

 tum, tegulae, lobes of mesonotum, except a blue spot on 

 middle of median lobe, rufous; wings uniformly infuscated, 

 veins black; male differs in having body wholly blue. 



Length 10 mm unicolor 



Antennal furrows extending as deep linear furrows above 

 base of antennae to near middle of face; body in female dull 

 blackj with pronotum, lobes of mesonotum, and usually 

 upper anterior corner of pleurae, rufous; wings uniformly 

 infuscated; male diflfers in having body entirely dull black. 

 Length 10 mm coUaris 



26. Head when viewed from above with a transverse furrow ex- 



tending behind eyes and ocelli 27 



Head when viewed from above with a transverse furrow 

 extending across head behind eyes, interrupted by an 

 oblique ridge extending from postocellar area to upper 

 posterior corner of eye; lateral lobes of mesonotum not so 

 densely punctate on the disk as at sides; body black, with 



