THE EUROPEAN CORN BORER AND ITS CONTROL. 39 



Adult Period. 

 The female moth begins the oviposition of first generation eggs within 

 a few days after emerging from the pupa. With 15 females, confined in 

 individual life-history cages, the average duration of the period between 

 emergence from the pupa and the fu-st oviposition was 3.6 daj^s, with a 

 maximum of 7 days and a minimum of 1 day (see Table XI). 



Table XI. — Oviposition by Female Moths in Rearing Cages, Second 

 Generation. 



The duration of the oviposition period of these 15 females averaged 

 14 days, with a maximum of 21 and a minimum of 6 days (see Table XI). 



The average length of life of 29 female moths, which were confined in 

 cages with male moths, approximating field conditions as nearly as pos- 

 sible, was 17 days, with a maximum of 29 and a minimum of 8 days. The 

 average length of life of 40 male moths in these same cages was 13 days, 

 with a maximum of 29 and a minimum of 6 days (see Table XII) . 



