THE MEXICAN COTTON-BOLL WEEVIL 265 



that it is doing now can scarcely be estimated at less than 

 twenty-five million dollars a year. 



The egg. The adult weevils that have lived through 



Courtesy U. 8. Bur. Entomology 



FIG. 173. LARVA OF BOLL WEEVIL IN A SQUARE OF COTTON 



the winter are ready to attack cotton as soon as the first 

 squares are formed in the spring. The eggs are very 



