‘ PLANT LICE. 17/3! 
Fic. 149.—Woolly aphis (Schizoneura lanigera Hausm.)—a, agamic female; b, lar- 
val louse; c, pupa; d, winged female with antenna enlarged above; all greatly 
enlarged and with waxy excretion removed. After Marlatt, Division of Ento- 
mology, Dept. of Agriculture. 
Fic. 149a.—Woolly aphis.—a, root of young tree illustrating deformation; b, sec- 
tion of root with aphides clustered overit; c, root louse, female; a and 4, nat- 
ural size; c, much enlarged. After Marlatt, Division of Entomolony, Dep. of 
Agriculture. 
