APHIDIVOROUS CHALCIDI^. 155 



Mr. Walker has paid much attention to the minute 

 Ichneumouidje, and it is principally on his authority 

 that the following remarks on the modern synonyms 

 of the above list are founded. 



GkrysoIam]jus susjpensus is believed to be identical 

 with Coryna {Goruna of Curtis) clavata, ^hich belongs 

 to the Proctotrupidse. Nees ab Esenbeck saw it 

 emerge from the larva of Ai^his rosarum. I have bred 

 Coryna from the silken tent which it constructs under 

 and between the legs of the dried larval skin of 

 Sii^lionopliora rosce and of Aphis rumicis. Whether it 

 feeds on the larva, or preys on the larva of the parasite 

 within the Aphis, is not yet perfectly clear. 



This curious economy of tent-making is not confined 

 to the members of this genus. M. Audouin discovered 

 the same constructive power in Microtomiis terminalis, 

 an insect which infests Coccinella punctata, and spins 

 a like cocoon below its body. 



The name Coryna has been altered from Coruna, 

 which was adopted by J. Curtis, who gives a good de- 

 scription of Goruna Garpenteri in his useful work on 

 * Farm Insects.' He there states that it is parasitic on 

 Ephedrus and not on Aphis, which I am also inclined 

 to believe. 



Gyrtogaster vulgaris was seen by Hahday to prey on 

 Aphides. 



Eurytoma wnea is synonymdiis with Asaplies cenea, 

 one of the Sphegigastridse. This insect is compact in 

 form, and unlike the lighter made Aphidius, on which 

 the young grub, hatched from the inserted egg feeds. 

 Thus, while the Asaphes proves itself a friend to the 

 Aphis, it is a foe to the agriculturalist, in a manner 

 similar to some Pteromali, which destroy the Coccinel- 

 lidse, the natural checks to the increase of Aphides. 



Mesolata elongata was seen by Nees to lay its eggs 

 in the bodies of Aphides previously infested by Aphi- 

 dius vari'us. Walker thinks it is identical with Asaphes 

 aphidiim and Eurytoma cenea. 



Myina flava is very small, and oviposits in GaUi- 



