18 HIBERNATION OF THE COTTON BOLL WEEVIL. 



Table II. — Counts to determine number of weevils per acre at time of entrance into 

 hibernation, in three localities in Texas. 



In connection with the work done at Dallas diirino; the fall of 1906 

 repeated estimates of the number of weevils per acre to be found 

 upon the stalks were made in the same field beginning October 12, 

 1906, and ending January 21, 1907. These figures are presented in 

 Table III. The number of plants per acre in this field was 8,300. 



Table III. — Number of weevils per acre upon stalks at different dates at Dallas, Tex. 



The table given above show^s a number of points which are of 

 exceptional interest. About November 1 it may be seen that the 

 number of w^eevils present was more than double the number of plants. 

 After that time there was found to be a steady decrease in the number 

 of weevils present upon the stalks. The most abrupt change was 

 to be found between November 10 and 20, when more than one-half 



