LIFE HISTORY OF THE CODLING MOTH IN MAINE. 



35 



Length of the feeding period of the transforming larvx. — During the 

 season of 1914 two methods, namely, the stock-jar and bagged- 

 fruit methods, were used for determining the feeding period of the 

 first-brood larvae. These methods are described on page 10. 



As in 1913, only a very small number of the first-brood larvae 

 transformed to first-brood moths. Out of a total of 845 larvae reared 

 at the laboratory 12 (1.4 per cent) transformed. 



In Table XXIX is given the length of the feeding period of the 

 transforming larvae of the first brood (stock-jar method). The aver- 

 age length of the feeding period for male and female larvae was 19.666 

 days; maximum, 21 days; minimum, 17 days. Average for male lar- 

 vae, 21 days; maximum, 21 days; minimum, 21 days. Average for 

 female larvae, 19.285 days; maximum, 21 days; minimum, 17 days. 



Table XXIX. — Length of feeding period of transforming larvae of the first brood, stock- 

 jar method, Winthrop, Me., 1914- 





Date of— 







No. of 



observa- 

 tion. 





Sex. 



Days of 



feeding. 



Hatch- 



Leaving 





ing. 



fruit. 







1 



July 6 



July 24 



9 



18 



2 



...do 



July 27 



<? 



21 



3 



July 8 



...do.... 



9 



19 



4 



...do.... 



July 28 



9 



20 



5 



...do.... 



Julv 29 



$ 



21 



6 



July 9 



...do.... 



9 



20 



7 



July 10 



July 27 



9 



17 



8 



...do.... 



July 31 



9 



21 



9 



July 13 



Aug. 2 



9 



20 



Average length of feeding period, male and female larvae, 19.666 days; male, 21 days; female, 19.285 days. 

 Maximum length of feeding period, male and female larvae, 21 days; male, 21 days; female, 21 days. 

 Minimum length of feeding period, male and female larvae, 17 days; male, 21 days; female, 17 days. 



The length of the feeding period of the transforming larvae of the 

 first brood (bagged-fruit method) is given in Table XXX. The 

 average length of the feeding period was 25.333 days; maximum, 26 

 days; minimum, 24 days. The average for the male larvae was 25 

 days; maximum, 26 days; minimum, 24 days. No record for female 

 larvae was secured. 



The average feeding period for all transforming larvae was 21.082 

 days, as given in Table XXXVIII. 



Table XXX. — Length of the feeding period of transforming larvae of the first brood, 

 bagged-fruit method, Winthrop, Me., 1914. 



No. of 

 observa- 

 tion. 



Date of— 



Sex. . 



Days of 

 feeding. 



Hatch- 

 ing. 



Leaving 

 fruit. 



1 

 2 

 3 



July 15 

 July 17 

 July 19 



Aug. 10 



...do 



Aug. 14 





26 

 24 

 26 



3 



Average length of feeding period, male and female larvae, 25.333 days; male, 25 days. 

 Maximum length of feeding period, male and female larvae, 26 days; male, 26 days. 

 Minimum length of feeding period, male and female larvae, 24 days; male, 24 days. 



