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



PLATi 



113 



Laboratory Methods in the Cotton Boll Weevil Investigations. 



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

 liistory worli. Fig. S.— Folding cage used in field experiments. Fig. 4.— Wire-screened 

 cage lised in hibernation experihients. (Original.) 



