SECONDARY PARASITES. 
127 
hrassicse at Mesilla Park, N. Mex., in conjunction with ApTiidius sp. 
Nothing definite is known of its life history. 
Paekyneuron sp. 
A species of Pachyneuron (fig. 36) has been repeatedly reared from 
Toxoptera graminum and it appears to be generally accepted as a 
Fig. So.—Aphidencyrtus aphidiphagus , 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- 
j unction with Apfielinus sp. from Toxoptera and with ApTiidius sp. from 
Fig. 3d.— Pachyneuron sp., a secondary parasite of the spring grain-aphis. Greatly enlarged. (Original.) 
Aphis 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 
M. erigeronensis and in connection with ApTielinus sp. from Schizo- 
