U. S. Dept. of Agriculture, Manual of Dangerous Insects. 



Plate IV. 



Dangerous Scale Insects. 



Fig. 1.— The Atriplex scale (Pulvinaria maskelU). Fig. 2.— A scale {*Orthczia insignis) of citrus, 

 tea, etc. Fig. 3.— The plum and peach scale {Lecanium prunastri). (Original, Sasscer.) 



