THE CODLING MOTH IN MICHIGAN. 



41 



Table XL. — Oviposition by moths of the spring brood in rearing cages, Douglas, Mich., 



1911. 



The shortest period before first egg deposition was 2 days, and the 

 maximum period 11 days. Within the separate cages oviposition 

 lasted from 1 to 19 days, with an average of 8.3 days. When we 

 consider the period from the date of emergence to the date of last 

 oviposition we find a maximum length of time of 23 days, an average 

 of 11.3 days, and a minimum of 4 days. 



Period of egg deposition.— In the field egg deposition is estimated 

 to have taken place from May 28 to July 18, with a maximum number 

 of eggs between June 10 and June 30. This has been estimated from 

 the records of egg deposition by moths in captivity, the time of emer- 

 gence of the moths, and the band-record observations. 



Length of life of moths. — The length of life of 153 male and 177 

 female moths, confined in the stock jars, is given in Table XLI. On 

 an average the males lived 9.18 days and the females 10.63 days. 

 The maximum length of life for the males was 18 days and for the 

 females 23 days. 



