398 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no 



5. Epistomal arch well sclerotized * 6 



Epistomal arch very lightly sclerotized or absent * 11 



6. Labial sclerite at least moderately sclerotized 7 



Labial sclerite never more than very faintly sclerotized 10 



7. Labial sclerite complete ventrally 8 



Labial sclerite incomplete ventrally ' 9 



8. Stipital sclerite and hypostomal spur well sclerotized . Pimplinae, Pimplini 

 Stipital sclerite and hypostomal spur very lightly sclerotized. 



Pimplinae, Acaenitini 



9. Setae present on prelabium Metopiinae 



Setae absent from prelabium ' Anomalinae 



10. Mandible v.ith grooved blade containing prominent tooth; hypostoma very 



lightly sclerotized; labial palps not disc-shaped .... Orthopelmatinae 



Mandible without grooved blade containing prominent tooth; hypostoma 



well sclerotized; labial palps disc-shaped Ichneumoninae 



11. Labial sclerite sharply pointed ventrally Diplazoninae 



Labial sclerite not sharply pointed ventrally 12 



12. Mandible with base sclerotized only at periphery Mesochorinae 



Mandible with base evenly sclerotized 13 



13. Stipital sclerite not extending laterally beyond point of meeting with spur of 



hypostoma Plectiscinae 



Stipital sclerite extending laterally bevond point of meeting with spur of 

 hypostoma 14 



14. Mandible with numerous fine teeth on dorsal side of blade . Adelognathinae 

 Mandible not toothed or with short blunt teeth on dorsal and ventral sides 



of blade 15 



15. Hypostoma not extending beyond lateral end of stipital sclerite, or with 



sclerotic band connecting posterior pleurostomal processes across dorsal 

 surface of food meatus, or with twelve or more setae situated largely within 



the membrane of the prelabium Lissonotinae 



Hypostoma extending beyond lateral end of stipital sclerite; sclerotic band 

 not present connecting posterior pleurostomal processes; if numerous 

 setae present on prelabium, they are scattered over a very broad labial 

 sclerite as well as over the prelabial membrane 16 



16. Many (more than four) setae scattered over broad labial sclerite and on 



membrane of prelabium Ophioninae, Ophionini 



Not more than four setae on prelabium 17 



17. Labial sclerite as wide or wider than long (in anteroposterior direction) and 



hypostomal spur longer than blade of mandible 18 



Labial sclerite longer than wide or, if not, then length of hypostomal spur 

 is equal to or less than length of blade of mandible. 



Ophioninae, Campoplegini 



18. Mandible conical in shape with small tooth at apex. 



Ophioninae, Tersilochini 

 Mandible not of this shape 19 



19. Closing apparatus of spiracle not well sclerotized and broader than spiracle. 



Ophioninae, Cremastini 



Closing apparatus of spiracle moderately sclerotized and as wide as or more 



narrow than spiracle Mesoleiinae 



<• E.xcept Listrodromus (Ichneumoninae, Listrodromini), Triclistus (Metopiinae), Xanthopimpla (Pim- 

 plinae, Pimplini). 

 » Except Exetastes (Lissonotinae) . ' Except Anomalon (Anomalinae. 



