166 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



corn, the lice will feed later upon the roots of pigeon-grass or 

 purslane. In early May the second generation of lice commence 



4 5 



FIG. 121. The corn-root aphis (A phis maidi-radicis Forbes): 1, wingless 

 vivaparous female; a, apex of abdomen; 2, antenna of same; 3, pupa; 

 4, winged vivaparous female; 5, antenna of same. (After Forbes.) 



to appear among them being both wingless and winged forms. 

 This brood and all of these during the summer are produced by 

 females known as agamic females, which give birth to live young 



