Bui. 51, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate XVI. 



Fig. 69, Infested squares not fallen but hanging- dried upon plant; fig. 70, refrigerator 

 designed for breeding weevils at low temperatures; tig. 71, boll opened, showing 

 three large larvae in one lock; fig. 72, apparatus used in studying effect of temperature 

 upon weevil movement— fig. 71 reduced to two-thirds natural diameter (original). 



