LIFE HISTOKY OF THE CODLING MOTH IN MAINE. 



25 



SECOND BROOD OF LARVAE. 



Time of "hatching. — By reference to Table XX it will be noted that 

 second-brood codling-moth eggs were hatching from August 23 to 

 October 15. Hence the larvae were hatching over a period of nearly 

 two months. 



Length of feeding period. — Observations on the feeding period of 

 the second-brood larvae are given in Table XXI. Although hatching 

 continued until October 15, none of the larvae which entered the fruit 

 later than September 11 matured. The first of the second-brood 

 larvae left the fruit September 25, the last November 21. The aver- 

 age feeding period for all larvae was 49.160 days; maximum, 77 days; 

 minimum, 31 days. The average feeding period for 47 male larvae 

 was 46.659 days; maximum, 77 days; minimum, 31 days. The 

 average feeding period for 57 female larvae was 50.245 days; maxi- 

 mum, 72 days; minimum, 33 days. It will again be noted that the 

 feeding period of female larvae is longer than that of the male. 



Table XXI. — Length of feeding period of second-brood larvae, stock-jar method, Winthrop, 



Me., 1913. 







[ 



Figures in parent! 



teses 



( ) denote sex undetermined.] 













Number 

 of indi- 

 viduals. 



Date of 



entering 



fruit. 



Length of feeding period in specified days. 



31 



33 



34 



36 



37 



38 39 



40 



41 \ 



3 



9 



3 



9 



3 



9 



3 



9 



3 



9 



3 



9 



3 



9 



3 



9 



3 



91 



3 

 3 

 9 

 7 

 8 



10 

 3 

 1 



20 



13 

 2 



11 

 2 

 5 

 5 

 2 

 2 



Aug. 23 

 Aug. 24 

 Aug. 25 

 Aug. 26 

 Aug. 27 

 Aug. 28 

 Aug. 29 

 Aug. 30 

 Sept. 1 

 Sept. 2 

 Sept. 3 

 Sept. 4 

 Sept. 5 

 Sept. 6 

 Sept. 8 

 Sept. 9 



Sfi-nt. 11 































1 







l | 











1 





















1 





1 















i 







l 

 l 



l 

 l 





1 







l ! 





1 



1 

















1 

 1 



1 











2 

 1 









1 



3 



1 

 1 





















i 





1 























1 





































































































1 



2 



1 









- 























































































































































































































































106 c? and 9 . 

 Sex undetermined. 







































1 







1 



l 



1 







3 







2 







4 



4 



3 



4 



2 



4 



1 



2 







































Tot 



al 



1 



2 



1 



3 



2 



8 



7 



6 



3 



93036°— Bull. 252—15- 



