LLUSTRATIONS. 



PLATES. 



Page. 



Pi.ATR I. Fig. 1.— Photomicro camera in operation. Fig. 2. — Interior of 



Cornell insectary, with copying camera arranged for taking an 



enlarged picture - - - 8 



II. Destructive work of apple plant-lice on fruit and leaves on large 



trees in New York in 1903. 72 



TEXT FIGURE. 



Fig. 1. A practicable, large, and efficient sticky shield for capturing adult 



grape leaf -hoppers in the spring 75 



4 



