76 



HYMENOPTERA ACULEATA. 



unite to foria it. The old families, SphcgiJx, rem/'hre- 

 doiridiv, and Mimes idm, belong to tlie first sectioUj the 

 remainder of our genera to the second. 



(38) 1. Anterior wings with more than one 

 submarginal cell, although the 

 second in Tri/poa-ylon is enclosed by 

 such exceedingly fine nervures that 

 it may be easily overlooked. 

 (9) 2. Mandibles with a deep incision on 

 their outer margins at some distance 

 from the base, or with the marginal 

 cell appendiculated. 

 (•1) 3. Eyes in the ^ meeting on the vertex, 

 eighth dorsal valve bearing peni- 

 cilli, both sexes with the mandibles 



simple Asiata. 



(3) 4. Eyes not meeting on the vertex in 

 either sex ; mandibles with an 

 incision beneath. 

 Three snbmarginal cells 

 Two submarginal cells. 

 Second submarginal petiolated . 

 Second submarginal not petiolated 

 Mandibles simple, marginal cell not 

 appendiculated. 

 (11) 10. Two submarginal cells, posterior and 

 apical nerves of second exceedingly 

 fine and transjiarent, hardly notice- 

 able ...... 



(10) 11. Two or more submarginal cells, all the 



nerves distinct. 

 (27) 12. Abdomen petiolated, and the petiole 

 formed of the ventral plate only, 

 the dorsal portion of the segment 

 uniting with it at some distance 

 from the base. 

 (14) 13. Petiole cylindrical, or nearly so, 



elongate Ammoimiila. 



Petiole flattened, often very short. 

 Anterior wings with two submarginal 



cells. 

 Anterior wings with only one recur- 

 rent nervure. 

 Recurrent nervure and apical nervure 

 of first submarginal cell interstitial 

 Recurrent nervure uniting with the 

 cubital near the centre of the first 

 submarginal cell .... 

 (10) 19. Anterior wings with two recurrent 

 nervures. 



Taciiytes. 



MiscGPHua. 



DiNETUS. 



TuYrOXTLON. 



SriLOMENA. 



Stigmus. 



