Bui. 436, U. S. Dept. of Agriculture. 



Plate j. 



Fig. 1.— Laboratory Cages Used in Life-History Work on the Desert Corn 

 Flea-Beetle. (Original.) 





Fig. 2.— Field Cages Used in Life-History Work on the Desert Corn 



Flea-Beetle. (Original.) 



Fig. 3.— Johnson Grass Along a Nl'.llmlu [ i iil,l M'j// anij ditch Bank. 

 A Deplorable Condition Favoring Insect Development and Affording 



