Bui. 60, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate II. 



Laboratory Methods in the Cotton Boll Weevil Investigations. 



Fig. 1.— Boxes used in breeding parasites and weevils. Fig. 2.— Breeding jar used in life- 

 history work. Fig. 3.— Folding cage used in rield experiments. Fig. 4.— Wire-screened 

 cage used in hibernation experiments. (Original.) 



