ILLUSTRATIONS. 



PLATES. 



Page. 

 Plate V. Fig. 1.— Damage to a field of corn in Indiana, in 1906, by the corn 

 root-aphis (Aphis maidi-radicis). Fig. 2. — Same field a year later, 

 showing the effect of applying barnyard manure 104 



TEXT FIGURES. 



Fig. 54. The corn root-aphis (Aphis maidi-radicis): Wingless, viviparous 



female 99 



55. The corn root-aphis: Winged, viviparous female » . 100 



56. The corn root-aphis: Oviparous female 104 



57. The corn root-aphis: Wingless male 104 



58. The corn root-aphis: Winged male 112 



59. Map showing distribution of Aphis maidi-radicis and Aphis middletoni 



in the United States 114 



TV 





