THE CANADIAN ENTOMOLOGIST. L65 



2. Abdomen petiolate ; mandibles 2-4-dentate ; maxillary palpi 5- or 6- 



jointed 4. 



Abdomen not petiolate. 



Abdomen subsessile, the first segment campanulate 3. 



Abdomen sessile, the first segment very small, rounded above, the 

 second very large, occupying most of the surface, the following 

 being more or less retracted ; second cubital cell wider than 

 long ; scutellum entirely covering the post-scutel- 



him Nectarinia, Shuckard. 



(Type Brachygastra analis, Perty.) 



3. Metathorax smooth or punctate ; abdomen rather short, subovate or 



oval Chartergus, Latreille. 



(Type Vespa apicalis, Fabr.) 

 Metathorax transversely striate or aciculate ; abdomen long, fusiform, 



or elongate ovate Polistes, Latreille. 



(Type Vespa biglumis, Linne.) 



4. Front wings with three cubital cells 5. 



Front wings with two cubital cells Paraicaria. Gribodo. 



(Type P. bicolor, Gribodo.) 



5. Abdomen with the first segment, or petiole, linear, the second segment 



more or less constricted or petiolate at base 7. 



Abdomen with the first segment, or petiole, clavate or subglobose at 

 apex, the second segment normal, not constricted at base. 



Second abdominal segment not especially large, not occupying 



most of the surface nor covering the third 6. 



Second abdominal segment very large, occupying most of the 

 surface, and covering the third, the terminal segments more or 

 less retracted; mandibles 4-dentate, the inner tooth the 

 smallest ; clypeus wider than long, slightly rounded or sub- 

 triangular anteriorly, but not dentate Icaria, Saussure. 



(Type I. artifex, Sauss.) 



6. First abdominal segment subcampanulate ; body of abdomen conical ; 



prothorax narrowed, not margined above ; temples as broad or a 



little broader than the width of the eyes Synceca, Saussure. 



(Type Vespa Surinama, Linne.) 



First abdominal segment variable, sublinear or clavate ; body of 

 abdomen fusiform, clavate or subovate ; prothorax short ; temples 



