122 THE SPRING GRAIN-APHIS OR " GREEN BUG.'' 



Other Species of Aphidius. 



ApJiidius confusus AsLm. has been- reared from Toxoptera from 

 different parts of the country, including the Department of Agri- 

 culture grounds in Washington, but to what extent it assisted in 

 overcoming Toxoptera in 1907 is not altogether clear. Its life 

 history is apparently similar to that of A. testaceipes Cress., and its 

 effect upon the aphides is apparently the same. 



ApJiidius avenaphis Fitch was reared from Toxoptera graminum in 

 the insect ary at the Department of Agriculture in Washington, the 

 host insect having been parasitized, under observation, by adult 

 virgin Aphidius reared from Aphis sp. 



Fig. 30. — Aphelinus mali, a parasite of the spring grain-aphis. Greatly enlarged, a, Stigmal club, 



much more enlarged. (Original.) 



Species of Aphidius, apparently undescribed, were sent to the 

 bureau from Xjoro, British East Africa, and the Orange Free State, 

 South Africa, as enemies of Toxoptera graminum in that country. 



Aphelinus. 



We have reared three species of Aphelinus from Toxoptera grami- 

 num; Aphelinus mali Hald., A. nigritus How., and A. semiflavus 

 How. 



Aphelinus mali Hald. (fig. 30) was reared from Toxoptera at 

 Lafayette, Ind., in 1885 by the senior author, by Mr. E. A. Vickery 

 at Richmond, Ind., and from the same species at Clemson, S. C, by 

 Mr. G. G. Ainslie. Messrs. Kelly, Urbahns, and Parks reared it from 

 Aphis setarise Thos. at Wellington, Kans. Messrs. Kelly and Urbahns 

 also reared it from Schizoneura americana Riley at Wellington. Mr. 

 Vickery reared it from Schizoneura lanigera Haussm. at Richmond, 



