266 AMERICAN HYMENOPTERA. 



11. Metaplenra separated from tlie iiotnm by a distinct carina; humeral cross- 



nervure broken below tlie middle L<abrossyta Foer 



Metapleura without carina between it and notuni ; humeral cross-nervure 

 broken far below the middle *Poly trera Foer. 



12. Humeral cross-nervure straight, not distinctly broken '-'Gnesia Foer. 



Humeral cross-nervure plainly angularly broken 13. 



13. Humeral cross-nervure broken above the middle 14. 



Humeral cross-nervure broken at or below the middle 15. 



14. Clypeus not plainly separated at base by an elevated margin ; .superior me- 



dian area of metathorax wanting ' (Tdeiiia Foer. 



Clypeus plainly separated by an elevated margin Otlophoriis Foer. 



1.5. Metanotum completely areolated 16. 



Metanotnm not completely areolated 18. 



16. Spiracles of segment 1 lie somewhat back of the middle. 



' HodoKtates Foer. 

 Spiracles lie in front of or at the middle of segment 1 17. 



17. Abdominal segments 2 and 3 broader than long; humeral cross-nervure 



broken below the middle Treiiiatopygiis Holmgr. 



Abdominal segments 2 and 3 not plainly broader than long ; hume7-al rross- 

 nervure broken at the middle •■ Syiiagrypiliis Foer. 



18. Clypeus not separated at base by an elevated margin 19. 



Clypeus separated at base by an elevated margin 20. 



19. Mesonotum with distinct parapsidal furrows in front: longer spur of hind 



tibise not half as long as heel segment Honiobia Foer. 



Mesonotum without parapsidal furrows; longer spur of hind tibise more than 

 half of the heel .segment •• Zeiiiiophora Foer. 



20. A sharp ridge extends from spiracles to apex of basal abdominal segment. 21. 

 No sharp ridge from spiracles to apex '''AilKti'phognatlioii Foer. 



21. Antennae swollen above middle and with segments broader than long and 



verticillate at apex of each Baryceros Prov. 



Antennfe slender, not strongly verticillate 22. 



22. Petiole of abdomen slender, longer than broad SyiiCBCef es Foer. 



Petiole of abdomen ti'iangular, as broad as long Westwoodia I'rov. 



23. Clypeus distinctly divided by a nearly median elevation, front half somewhat 



flattened and somewhat sloping (usually differently colored than the 



base) 24. 



Clypeus without plain transverse median ridge 32. 



24. Front above antennse with a strong tooth ; face elongate 25- 



Front without strong projecting tooth 26. 



25. Projecting tooth concave above ; spiracular grooves at sides of clypeus beset 



with long hairs ■ Coeloconus Foer. 



Projecting tooth not or but slightly concave ; clypeal grooves not beset with 

 long hairs Cosino<*onus Foer. 



26. Metanotum not regularly areolated. but with carinse 27. 



Metanotum more or less perfectly areolated 28. 



27. Metanotum polished, transverse carina wanting; longitudinal carinje strong. 



.sharp and well defined Quadrigana Davis. 



Metanotum smooth and provided with a prominent transverse apical ridge. 



'''Psilosage Foer. 



