No. 22.] HYMENOPTERA OF CONNECTICUT. 69 



Dolerus Jurine. 

 Key to Species. 



1. Surface of apex of scutellum entirely smooth 2 



Surface of apex of scutellum wholly or in part punctate or 



striate 14 



2. Mesonotum with median lobe either finely punctate or almost 



impunctate at middle, and with large, coarse punctures or 



rugosities at sides 3 



Mesonotum with median lobe uniformly punctate at middle 

 and at sides, at least never with a band of large punctures 

 on each side 1 1 



3. Pectus with three longitudinal rows of punctures that are 



distinctly larger than the adjacent punctures 4 



Pectus not with three rows of larger punctures; if any of the 

 punctures are larger than others, then not arranged in rows 10 



4. Vertical furrow with its lateral margin continued as an ele- 



vated area to upper corner of eye 5 



Vertical furrow with its lateral margin not extended as an 

 elevated area below lateral ocelli 7 



5. Head with a distinct carina between posterior orbits and 



occiput; postocellar area and upper orbits uniformly punc- 

 tate; median lobe of mesonotum more densely punctate 

 than lateral lobes; lateral lobes and the scutellum uni- 

 formly punctate; body dull black; wings fuliginous. 



Length 10-12 mm sericeus 



Head not with a distinct carina between posterior orbits 

 and occiput; postocellar area with fewer, smaller punc- 

 tures than upper orbits 6 



6. Scutellum and inflexed and dorsal portions of lateral lobes 



of mesonotum with the punctuation similar in size and 

 arrangement; vertical furrows distinct and sharply cut, 

 with an impunctate area on the posterior orbits; median 

 lobe of mesonotum more densely punctate than lateral 

 lobes; body dull black; wings infuscated, especially around 



the margins. Length 10 mm parasericeus 



Scutellum and inflexed portion of mesonotum with punc- 

 tuation larger and distinctly denser than on dorsal surface; 

 vertical furrows distant and sharply cut, with an impunc- 

 tate area on upper orbits; median lobe of mesonotum 

 distinctly more densely punctate than lateral lobes; body 

 dull black; wings fuliginous. Length 12 mm neosericeus 



7. Punctures on scutellum more sparse and twice as large 



as those of lateral lobes of mesonotum; vertical furrows 

 deep with sloping sides; postocellar area more finely punc- 

 tate than posterior orbits; head with a carina between occi- 



