SECONDARY PARASITES. 



127 



Irassicse at Mesilla Park, N. Mex., in conjunction with ApTiidius sp. 

 Nothing definite is known of its life history. 



Pachyneuron sp. 



A species of Pachyneuron (fig. 36) has been repeatedly reared from 

 Toxoptera graminum and it appears to be generally accepted as a 



Fig. 35. — Aphidencyrtus aphidipliagus , a secondary parasite of the spring grain-aphis. Greatly 



enlarged. (Original.) 



secondary parasite. Mr. Kelly has observed it ovipositing in brown 

 parasitized MacrosipTium viticola. Mr. G. G. Ainslie reared it in con- 

 junction with, Aphelinus sp. from Toxoptera and with ApTiidius sp. from 



Fig. 36. — Pachyneuron sp., a secondary parasite of the spring grain-aphis. Greatly enlarged. (Original.) 



Aplds maidis from Clemson, S. C, and from Toxoptera at St. Anthony 

 Park, Minn. Mr. C. N". Ainslie reared it in connection with ApTiidius 

 sp. from ApTiis setarise, A. gossypii, MacrosipTium granaria, and 

 If. erigeronensis and in connection with ApTielinus sp. from ScTiizo- 



