No. 22.] HYMENOPTERA OF CONNECTICUT. 469 



7. First funicular joint of antennae rarely abruptly smaller than 



the others 8 



First funicular joint of female antennae abruptly smaller than 

 the others, funicle thick, antennae inserted almost in the 

 middle of the face, which is impressed with large punc- 

 tures; thorax above smooth, metathorax very short; ovi- 

 positor exserted Roptrocerus 



8. Antennae inserted below the middle of the face, stigmal club 



not distinct, vertex medially not acute, cheeks round, left 

 mandible 3-, right 4-dentate, club of male antennae black- 

 ish, head with narrow vertex, ocelli in female with the 

 posterior pair nearer the anterior one than to each other; 

 thorax short, metathorax with distinct lateral folds, mar- 

 ginal vein one and one-half times as long as the stigmal; 



abdomen not rotund Eutelus p. 478 



Genera differing from Eutelus; head often triangular and 

 with prominent eyes, clypeus without an apical tooth, 

 but sinuate or truncate at apex; pronotum often not 

 at all or only slightly defined, wings with a small or me- 

 dium-sized stigmal club 9 



9. Pronotum broad 10 



Pronotum narrow; mandibles 3-dentate Psilocera p. 470 



10. Head with the vertex sometimes medially acute; eyes not 



hairy n 



Head with cheeks bulging, vertex not acute medially, eyes 

 not prominent, first funicular joint of antennae longer than 

 pedicel; pronotum broad, sternal groove obsolete, meta- 

 thoracic spiracles usually large, oval; left mandible 3-den- 

 tate Hetroxys (Habrocytus) p. 478 



11. First funicular joint large 12 



First funicular joint small Pteromalus (Meraporus) p. 478 



12. Metathorax with a large subglobose neck; flagel filiform; 



abdomen in female ovate-acute; postmarginal vein longer 



than stigmal *3 



Metathorax usually with a very small neck, postmarginal vein 

 often shorter than stigmal, very rarely longer; abdomen 

 in female usually rotund *4 



13. Wings entirely pubescent, neck of metathorax smooth; 



cheeks concave Pteromalus (Catolaccus) p. 476 



Wings not entirely pubescent, but with a large clear spot; 

 neck of metathorax punctate; mandibles usually 4-den- 

 tate, antennae often inserted below the middle of the face, 

 ring-joint distinct; metathorax usually punctulate and 

 furnished with a carina; abdomen often rotund, never pro- 

 duced at apex in the female Pteromalus p. 471 



14. Postmarginal vein shorter than stigmal or as long as the 



same T 5 



