No. 22.] HYMENOPTERA OF CONNECTICUT. 249 



but covered by short, rather dense pubescence; propo- 



deum truncated behind and rather coarsely rugose 



Thyreodon p. 287 

 Wings hyaline, stigma distinct, well developed; clypeus at 

 apex truncate; ocelli prominent; thorax and legs glabrous; 

 propodeum rounded behind, not rugose Ophion p. 287 



49. Abdomen rarely coarsely and deeply punctate, if so, hind 



tibiae not provided with two spurs 50 



Abdomen deeply and coarsely punctate or aciculate; scutel 

 large, usually margined; hind tibiae provided with two 

 spurs ; robust genera 98 



50. Face not strongly protuberant, or if so, clypeus distinct 51 



Face strongly protuberant and coarsely punctate; clypeus 



not defined or else small 91 



51. Mandibles bidentate or toothless 52 



Mandibles tridentate 88 



52. Hind tibiae with two spurs; abdomen petiolate, or, if sessile, 



exserted portion of ovipositor shorter than abdomen or 

 not at all exserted; hind legs not both long and thick; 

 antennae not short and straight; mandibles not projecting 

 forward and riot forming a visible cavity with clypeus; 

 head and clypeus normal, the latter usually narrowed and 

 nearly elliptical; areolet not large and rhomboidal, quad- 

 rangular, triangular or wanting, rarely an irregular pen- 

 tagon; male without styloid projections; scutel not pro- 

 vided with a discal spine, stigma present; ovipositor not 

 or scarcely exserted, if prominently exserted, then lunulas 

 present, otherwise lunulae wanting or at least not present 

 on both second and third dorsal segments in same indi- 

 vidual; propodeum not sloping directly from base 53 



Hind tibiae without spurs, or at most with a single small one; 

 teeth of mandibles equal in length 69 



53. Tarsal claws not pectinate, or with only a few strong teeth 



at base, in which case clypeus usually extends from eye 



to eye 54 



' Tarsal claws pectinate ^7 



54. Abdomen petiolate, petiole at its base without a groove or 



carina, or the latter at least never prominent 55 



Abdomen sessile or subsessile, with a plain furrow or sharp 

 carina on petiole, seldom subpetiolate, but, if so, then al- 

 ways with prominent carinae; eyes not emarginate within.. 66 



55. Head not exceptionally enlarged 56 



Head exceptionally enlarged; longer spur of hind tibiae 



shorter than second joint of hind tarsi; wings with an 

 areolet Spanotecnus p. 292 



56. Flagel 35- to 40-jointed, frequently thickened; petiole usually 



arched; in female last abdominal segments so recurved 

 that ovipositor seems to lie on the back 64 



