April, ’20] McCOLLOCH: OVIPOSITION OF THE CORN EARWORM 
247 
Fig. 7. Graph showing the total number of eggs found daily for the years 1913 
to 1918, and the average date of first, maximum and last silking for each variety 
of corn with relation to the date of planting. 
of the present work confirm the findings of Headlee since during the 
six years that these investigations have been in progress three distinct 
broods have been in evidence each season. Life history studies con¬ 
ducted under practically natural conditions have shown that a small 
partial fourth brood may emerge late in the fall. The results of the 
present study, however, indicate that this brood is of little importance, 
especially with regard to corn. 
