LIFE HISTORY OF THE CODLING MOTH IN MAINE. 



33 



Table XXVII. — Length of life of male and female moths of spring brood in captivity. 

 Summary of records of 138 individual moths, Winthrop, Me., 1914. 



Male. 



Female. 



Male. 



Female. 



Length 

 of life. 



Number 

 of moths. 



Length 

 of life. 



Number 

 of moths. 



Length 

 of life. 



Number 

 of moths. 



Length 

 of life. 



Number 

 of moths. 



Days. 

 2 

 3 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 



1 

 1 



3 

 3 

 1 



9 

 7 

 3 

 5 

 5 

 4 

 2 

 5 



Days. 

 1 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 



2 

 1 

 6 

 2 

 3 

 2 

 4 

 2 

 3 

 10 

 7 

 4 

 1 



Days. 



17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 27 

 32 



6 

 3 

 5 

 3 



Dai/s. 



'17 

 18 

 20 

 21 

 22 

 24 

 25 

 27 

 28 



4 

 4 

 2 

 2 

 2 

 1 

 1 

 1 

 2 



72 



66 



Average length of life of male moths, 13.708 days; female moths, 13.621 days. 

 Maximum length of life of male moths, 32 days; female moths, 28 days. 

 Minimum length of life of male moths, 2 days; female moths, 1 day. 



THE FIRST GENERATION. 



FIRST BROOD OF EGGS. 



Length of incubation. — Observations of the embryological changes 

 and incubation periods of 2,672 eggs are recorded in Table XXVIII. 

 Of this number, 2,633 (98.54 per cent) hatched. The average number 

 of days from the time of oviposition to the appearance of the red 

 ring was 2.599; maximum, 5 days; minimum, 2 days. The average 

 number of days from the time of oviposition to the appearance of the 

 black spot was 6.139; maximum, 10 days; minimum, 5 days. The 

 average incubation period was 7.797 days; maximum, 13 days; mini- 

 mum, 6 days. 



