PARASITIC HYMENOPTERA. 93 



to my friend, whose skill as an engraver, aided by his intimate 

 knowledge of the subject, has mainly contributed to render 

 these pages intelligible. I may say with Marcel de Serres : 

 In this work I have no merit but that of generalizing. c 



Art. VII. — Essay on the Classification of Parasitic 

 Hymenoptera, §-c. By A. H. Haliday, Esq. M.A. 



{Continued from Vol.1, page 491.) 



Of the Ichneumones of the Second Line, (Ichneumones adsciti, 

 Essenbeck.) 



Subgen I. — Aphidius. 

 Aphidius. Essenbeck. Fam. II. 



Areola disci antica et cubitalis interior confluentes : stigma 

 trigonum: abdomen lanceolatum petiolatum vel subpetio- 

 latum : valvula centralis inermis : antennarum articulorum 

 numerus varius mari audits : palpi varii. 



Areola magna irregularis disci fere ut in Ichneumonidibus genuinis 

 sita est, a cubitali exteriore saepius equidem vix apice discreta ; 

 mox etiam limites postice sensim obliterati evanescunt in aliis, 

 areola ut in Trioxei penitus effusa. : antennarum vero norma in 

 singulis speciebus non adeo mutabilis ut ejus ratio prorsus negli- 

 genda sit, unius aut alterius articuli incrementum facile patitur, 

 vel etiam plurium siquibus ille numerus viginti in universum 

 superet : abdominis segmentum dorsal e secundum impressione 

 transversa bipartitum est, incisure ventrali secund& ibidem pallido- 

 perlucente ; inde fit quod abdomen nunquam totum nigrum extat. 

 Quae semel monuisse satis sit. 



Species quum ingenti copia, turn cbaracterum subtilitate vel etiam 

 inconstantia implicitae, discrimen curatius locorum atque victus 

 ratione confirmatum postulant. Quae modo ut attingam non 

 tempus otium nee industria fiduciam praestitere. Satis babui 

 nonnullas sectiones quarum ope forsitan ista multitudo commodius 



e Dans ce travail je n"ai d'autre m£rite qui d'avoir generalise. — Marcel de 

 Serres. 



