THE CODLING MOTH IN MICHIGAN. 



41 



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



1911. 



Cage 

 No. 



Num- 



Date of— 



Number of days — 













From 



ber of 



moths. 



Emer- 

 gence of 



First 

 ovi- 



Last 

 ovi- 



Before 

 ovi- 



Duration 

 of ovi- 



date of 

 emer- 

 gence to 

 last ovi- 







moths. 



position. position. 



position. 



position. 















position. 



1 



13 



May 24 



May 28 



June 14 



4 



18 



21 



2 



20 



May 29 



June 3 



June 21 



5 



19 



23 



3 



9 



May 30 



June 10 



June 10 



11 



1 



11 



4 



10 



May 31 



June 6 



June 8 



6 



3 



8 



5 



5 



June 1 



...do 



June 9 



5 



4 



8 



6 



29 



June 2 



...do 



...do 



4 



4 



7 



7 



39 



June 3 



June 5 



June 21 



2 



17 



18 



8 



47 



June 4 



June 8 



June 20 



4 



13 



16 



9 



40 



June 5 



June 9 



June 9 



4 



1 



4 



10 



43 



June 6 



...do 



June 24 



3 



13 



18 



11 



29 



June 7 



June 10 



June 20 



3 



11 



13 



12 



56 



June 8 



June 11 



June 23 



3 



13 



15 



13 



45 



June 9 



June 12 



June 15 



3 



4 



6 



14 



50 



June 10 



June 13 



June 22 



3 



10 



12 



15 



14 



June 17 



June 22 



June 26 



5 



5 



9 



16 



48 



June 19 



June 23 



June 27 



4 



5 



8 



17 



38 



June 23 



June 25 



...do 



2 



3 



4 



18 



44 



June 24 



June 27 June 30 



3 



4 



6 



19 



16 



June 25 



...do | July 2 



2 



6 





Average 



4 



8.3 



11.3 



Maxin 



lum 





11 

 2 



19 



1 



23 



4 



Minirr 



um 











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 maies 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. 



