No. 22.] HYMENOPTERA OF CONNECTICUT. I49 



thorax somewhat, and legs below knees, white; scutellum 

 with a few scattered coarse punctures behind; scutellar 

 appendage flat and impunctate; median fovea continuous 



with ocellar basin. Length 5 mm minutus 



Front not with a large puncture on each side, sometimes 

 with end of antennal furrow enlarged and punctiform 3 



3. Mesonotum with median lobe more densely punctate than 



lateral lobes; body black, with tegulae and legs below knees 

 white; saw-guides straight above and below, and obliquely 

 rounded to a blunt point at apex above; apex of scutellum 

 finely densely punctate; scutellar appendage flat and punctate. 



Length 6 mm tiliae 



Mesonotum with the median lobe, if punctate, uniformly punc- 

 tate with the lateral lobes 4 



4. Scutellar appendage flat and not carinate at middle 5 



Scutellar appendage longitudinally carinate at middle 6 



5. Area in front of median ocellus smooth; body black, with 



legs below trochanters more or less whitish, sometimes 

 strongly infuscated; wings infuscated; head and thorax 

 impunctate; saw-guides with sides straight and obliquely 



rounded at apex. Length 6 mm nubilipennis 



Area in front of median ocellus always more or less rough- 

 ened; body black, with tegulae and legs below knees, white; 

 wings slightly infuscated; scutellum coarsely punctate at 

 sides behind; saw-guides obliquely rounded to a blunt 

 point at apex. Length 6 mm bipunctatus 



6. Scutellum and metathorax uniformly densely punctate; body 



black, with tegute, pronotum for the most part, front legs 

 beyond bases of femora, and middle and hind legs beyond 

 knees, white; front finely punctate; ocellar basin fairly 

 distinct; saw-guides oblique at apex and pointed. Length 



5.5 mm aequaUs 



Scutellum more densely punctate than metathorax 7 



7. Head with V-shaped furrow behind the median ocellus distinct; 



body black, with tegulae, margin of pronotum more or less, 

 and legs beyond knees, white; wings yellowish hyaline; 

 saw-guides with two edges parallel and obliquely trun- 

 cate at apex. Length 6.5 mm plicatus 



Head with V-shaped furrow behind the median ocellus indefinite, 

 almost obliterated; body black, with labrum, tegute, pro- 

 notum entirely, legs beyond knees, and a narrow margin 

 at apex of each tergal and ventral segment, white; wings 

 yellowish hyaline; saw-guides with two sides parallel, 

 squarely truncated at apex, with lower corner rounded. 

 Length 6 mm transversus 



