154 BRITISH APHIDES. 



simple and almost veinless. There is, however, a 

 strong subcostal vein, which runs parallel for a short 

 distance with the costal vein, with which it for a space 

 unites ; and afterwards it descends obliquely into the 

 membrane of the wing. There it ends in a kind of 

 knob or thickening. The antennse sometimes differ in 

 the two sexes, and the female head is often dilated be- 

 yond the breadth of the thorax. Mostly the ova are 

 deposited directly within the larvse of their victims ; 

 but in some instances, as in Pteromalus ovulorum, the 

 Chalcid egg is deposited within the egg of its victim. 

 The parasitic egg afterwards discloses the young grub, 

 which attacks the Aphis hardly older than itself. 

 Thus the insect is born with its pest- — the fell cause 

 of its ultimate destruction. 



The Chalcidia? differ from the ProctotrupidtB, inas- 

 much as the latter have longer palpi, and the number 

 of their antennal joints is from ten to sixteen. 



The following species of ChalcidiaD are quoted from 

 a list drawn up by Dr. Reinhardt ; but some, it will be 

 seen, are only connected with the Chalcidise by inter- 

 venins: hnks. 



Agonioneurus flavicornis, Foerster . 



— suhflavescens, Westw. 

 Callimone auratus. 

 CJwysolampus apliidii)hagiLSj Ratz. 



— ceneus, Ratz. 



— suspensuSy Nees ab Esenbeck. 

 Gorynoj clavata^^2i]k. 

 Cyrtog aster vul^ris. Walk. 

 Diplolepis aphidis, Bouche. 

 Eurytomia cenea, Nees. 

 Hypsicamara Batzhurgii, Foerst. 

 Mesosela elongata, Walk. 

 Myina chao7iia, Walk. 

 Pteromalus aphidivorus, Foerst. 



— ovulorum, Foerst. 

 Spalangia nigra, Latr. 

 Tridymus apliidium, Ratz. 



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