No. 22.] HYMENOPTERA OF CONNECTICUT. 569 



2. Abdomen with only three or fotu; segments 3 



Abdomen with seven or eight dorsal segments 4 



3. Second abdominal segment not greatly lengthened, third 



long and strongly compressed from sides Leptorhaptus p. 570 

 Second abdominal segment very much lengthened, extending 

 nearly to tip of abdomen, third issuing from it as a short 



stylus Cinetus p. 570 



4. Abdomen with eight dorsal segments 5 



Abdomen with seven segments Acropiesta p. 570 



5. Eyes bare Psilomma p. 573 



Eyes hairy 6 



6. Middle carina of metanotum not divided 7 



Middle carina of metanotum divided or absent Belyta p. 571 



7. Postscutellum normal, unarmed . 8 



Postscutellum armed with a strong spine Oxylabis p. 571 



8. Third dorsal abdominal segment not or very little longer 



than fourth 10 



Third dorsal abdominal segment much longer than fourth . . 9 



9. Mandibles small and short Miota p. 571 



Mandibles long, falcate Xenotoma p. 572 



10. Marginal cell closed II 



Marginal cell open at apex 12, 



11. Stigmal vein straight from margin Zelotypa p. 572 



Stigmal vein oblique Pantoclis p. 572 



12. Stigmal vein perpendicular to the margin Zygota p. 572 



Stigmal vein oblique Aclista p. 573 



Males. 



1. Petiole of abdomen nearly twice as long as metathorax 2 



Petiole of abdomen not or scarcely longer than metathorax. . 4 



2. Second abdominal segment compressed laterally, petiole 



above smooth 3 



Second segment not compressed laterally, petiole above more 



or less furrowed Cinetus p. 57 



3. Antennal scape as long as first funicular joint 



Leptorhaptus p. 570 



Antennal scape shorter than first funicular joint Miota p. 571 



4. Middle carina of metathorax not divided 5 



Middle carina of metahorax divided or absent Belyta p. 571 



5. Postscutellum simple, not spined 



Postscutellum armed with a strong spine Oxylabis p. 571 



6. Eyes hairy 



Eyes bare, mesonotum with furrows Psilomma p. 573 



7. Scape with apical margin on one side produced into a tooth 



Acropiesta p. 570 



Scape normal, not toothed at apex 8 



8. Marginal cell completely closed 9 



Marginal cell open at apex 12 



