GRAIN APHIS. 
25 
said to be useful, and not to be useful, in getting rid of these grubs, 
and probably the difference in success of the application depends very 
much on the above-mentioned power of the grub to moult its skin. 
CORN AND GRASS. 
Grain Aphis. Aphis granaria, Kirby, Curtis ; Siphonopliora granaria, 
Buckton. 
Aphis granaria. 
1—4, winged and wingless Aphides, nat. size and mag. (3 and 4 discoloured from 
attack of Parasite Ply ; 5, 6, Aphidius avence; 7, 8, Ephedrus plagiator (parasite 
flies), nat. size and mag. 
The Grain Aphis is sometimes very injurious to Wheat, Barley, 
and Oats ; in the present year the only note sent in was from Hagley, 
near Alcester, where a large proportion of a twenty-acre field of Wheat 
after Clover layer was infested by it. 
Very little (if anything) appears to have been done at present 
towards getting a hold on the attacks of this Aphis, but, by putting 
together observation from different countries, there does not seem any 
reason why it might not be checked. 
With regard to its winter history, it was observed by Dr. C. 
Thomas, late State Entomologist of Illinois, U.S.A., that when winter 
Wheat appeared above ground in the autumn the Aphides appeared on 
it. He says;—“Here they work upon the leaves and stalks singly 
