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



Plate XIII. 



Pupal Cells of the Bollworm. 



Fig. 1, Pupa of the bollworm in its burrow in the soil, somewhat enlarged; fig. 2, plaster of Paris 

 casts of pupal cells, showing variation in depth and direction, natural size (original). 



