THE EUROPEAN CORN BORER AND ITS CONTROL. 33 



Adult Period. 

 Soon after emerging from the pupa the female moth begins the ovi- 

 position of second generation eggs. With 13 females, confined in indi- 

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

 emergence from the pupa and the first oviposition, was 3.2 days, with 

 a maximum of 9 days and a minimum of 1 day (see Table V). 



Table V. — Oviposition by Female Moths in Rearing Cages — First 

 Generation. 



The duration of the oviposition period of these 13 females averaged 

 15 days, with a maximum of 24 and a minimum of 6 days (see Table V). 



The average length of life of 23 female moths, confined in cages with 

 male moths, approximating field conditions as nearly as possible, was 

 IS days, with a maximum of 28 and a minimum of 6 days. The average 

 length of life of 27 male moths in these same cages was 14 days, with a 

 maximum of 35 and a minimum of 3 days (see Table VI). 



