ELEMENTARY ENTOMOLOGY 



infrequently such caterpillars are ruthlessly destroyed on the sup- 

 position that these are the eggs of the caterpillars, whereas they 

 are its worst enemies and should always be protected. The bra- 



conids are small, wasplike flies, from one 

 sixteenth to one eighth of an inch long, 

 of brown or yellow-and-black colors. 



FIG. 398. Dead green- 

 bugs, showing holes from 

 which parasites emerge. 

 (Much enlarged) 



The upper figure shows the lid 

 still attached, and the lower 

 shows the parasite emerging. 

 (After Webster, United States 

 Department of Agriculture) 



FIG. 399. Wheat-louse parasite (Aphidius 

 granariaphis Cook) and parasitized aphid 

 from which a parasite has emerged. (Much 

 enlarged) 



(Copied from J. B. Smith) 



FIG. 400. Sphinx caterpillar with cocoons of braconid parasites 



