50, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate XIX. 



Plant and Insect Parasites of the Bollworm. 



Fig, 1, Microplitis nigripennis, adults below; above, cocoons and parasitized bollworm, showing 

 black sear made by the emerging grub; fig. 2, Archytas piliventris, a Tachinid fly parasitic on 

 the bollworm; tig. 3, bollworm killed by bacterial disease; fig. 4, bollworm killed by fungus — 

 all figures twice natural size (original). 



