Bui. 77, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate IV. 



Hibernation Experiments, Dallas, Tex., 1905-6. 



Fig. 1. — Four-SL'ction cage used for experiments, l)uilt over cotton. Fig. 2. — Slielter conditions as 

 occurring naturally in section 1. (Original.) 



