207 



Fig. 216. The European Grain-louse, Siphocoryne avewe: a, winged viviparous female; r, its 

 antenna; b, sexual female; d and e, tip of male abdomen from side and beneath; /, ti]) of fe uile 

 alidomen from beneath. Enlarged as indicated. (Perganfle, U. S. Dept. of Agriculture.) 



In a letter from Dr. C. M. Weed, dated at Columbus, Ohio, November 

 2, 1888, he informs me that he found the grain-aphis early in the season 

 establishing colonies on the older leaves of corn plants; but since Per- 

 gande* has shown that three or four species have until lately been con- 

 fused under this common name the identity of the species observed 

 by Weed is doubtful. Our specimens of grain-aphis from Illinois belong 

 as a rule to the present species as described by Pergande. It occurs 

 principally on wheat and oats but also on grasses and wild rye. 



*Bull. No. 44, N. S., U. S. Dept. Agr., Div. Ent., i). .5. 



