122 
THE SPRING GRAIN-APHIS OR " GREEN BUG." 
Other Species of Aphidius. 
Aphidius confusus Ashm. 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 avenapliis Fitch was reared from Toxoptera graminum in 
the insectary 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, 
much more enlarged. (Original.) 
Stigmal club, 
Species of Aphidius, apparently undescribed, were sent to the 
bureau from Njoro, 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. semijiavus 
How. 
Aphelinus mali Hald. (fig. 30) was reared from Toxoptera at 
Lafayette, Ind., in 1885 by the senior author, by Mr. R. 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 seiarix 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, 
