64 



Tablk XVI. — Activity of five weevils in different 2><fvts of the day. 



An exnniination of these figures shows that weevil activity began 

 and ceased at about 75° F. Activity increased as the temperature 

 rose, and its maximum coincided with the maximum of daily tem- 



Fig. 8. — Diagram showing average arttivity of five female weevils. (Original.) 



perature. It then decreased wiih the falling temperature until it 

 ceased eutirelj^ some time during the evening, probably at about 

 75° F. See fig. 3. Feeding continued at lower temperatures than 

 oviposition, as is known to be the case during the late fall. 



Examinations made in the field between 6 and 7 a. m. on Septem- 

 ber 4 showed that all weevils, l)oth males and females, were quietly 

 resting at that time with the temperature at about 70° F. On cloudy 

 days the activity is less than it is on clear days. 



