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



Plate XIX. 



Plant and Insect Parasites of the Bollworm. 



Fig. 1. ^ficwpUtis nigripennis, adults below; above, cocoons and parasitized bollworm, showing 

 black scar made by the emerging grub; tig. 2, Archt/tas pilirentris, a Tachinid fly parasitic on 

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

 all tigures twice natural size (original). 



