208 



Fi<;. 217. The English Grain-louse, Macrosiphum qranaria; winged female 

 (a) and its antenna (6). Enlarged as indicated. (Pergande, U. S. Dept. of 

 Agriculture.) 



The Clover Plant-louse. 



Macrosiplmni {rifolii Perg. 



On the upper leaves of experimental corn in an inclosed frame at 

 the University of Illinois Mr. H. Garman found colonies containing 

 young, pupse, wingless females, and characteristic winged females of 

 this species (Fig. 218), recently described by Pergande in the paper 

 just cited. Another winged example was taken by us on a corn leaf 

 at Urbana. This is a pale green species with unusually long cornicles, 

 and with numerous sensoria crowded along the outer side of the third 

 antennal joint. It is common on red clover, strawberry, dandelion, 

 and sow-thistle, and lias also been found occasionally on wheat and oats, 



