56 GENERA OF HYMENOPTERA. 



Posterior femora simple ; head transveree. vertex not or scarcely excavate, 

 the middle ocellus not placed in a fovea. 



Abdomen linear, lonjrer tluin the tliorax Macrocentrinse. 



Abdomen ovate, not longer than the thorax. 



Occiput margined, distinct from the vertex : anal cell of anterior wings 



with an inc()nii)lctc transverse ncrvure Diospilinse. 



Occiput not uiargiiu'd ; anal cell of anterior wings without transverse 

 nervure Opiinse. 



Div. v.— EXODONTES. 



Anterior wings with three submarginal cells, rarely apterous or subapterous. 



Alysiinse. 

 Anterior wings with two submarginal cells Dacnusinse. 



Div. VI.— FLEXILIVENTRES. 

 Posterior wings with only two longitudinal uervures; the median cell often in- 

 complete, the submediau cell wanting Aphidiinae. 



Table of Genera. 

 Division I.— CYCLOSTOMI. 



Subfamily Braconin.**;. 



Abdomen with numerous broad sti'ongly serrate transverse impressions. 



' Ipliiaiila.Y Fiirst. 

 Abdomen without or with only one serrate transverse impression. 



Clypeus with two tufts of hair at base; mouth elongate, beak-like; abdominal 



segments 1-2 straight, not rectangularly articulated •■ Vipio Latr. 



Clypeus without hair-tufts at base ; mouth not prolonged ; abdominal segments 

 1-2 rectangularly articulated ISi'iicoii Fabr. 



Sul)fhniilv EXOTHECIN.E. 



Suturiform articulation distinct, sometimes crenate ' I'liaiioiiierii^ Fiirst. 



Suturiforni articulation obsolete. 



Marginal nervure originating beyond the middle of stigma. 



Aciiarolist P'orst. 



Marginal nervure originating much before the middle of stigma. 



KxotllCCIIM WesHI. 



Marginal nervure originating from the middle of stigma. 

 Second submarginal cell receiving the recurrent nervure. 



''Itath.VMfoiiiiiN Forst. 

 First submarginal cell receiving tlie recurrent nervure. 



'Kli.VMipolis Forst. 



Sul)faiiiily Rhyssalin^e. 



Posterior tarsi shorter than ilieir tiliia', tlu' latter incrassate in %; nietalhorax 

 areolated ; marginal nervure originating somewhat beyond the middle 

 of stigma; recurrent nervure interstitial " KIi.vnsuIiim Hal. 



