LIFE HISTORY OF THE CODLING MOTH IN MAINE. 



45 



THE SECOND GENERATION. 



SECOND BROOD OF EGGS. 



Length of incubation. — On August 20 the first egg of the second 

 brood was deposited. Oviposition continued until September- 18, 

 reaching the maximum on August 31. Out of 138 eggs deposited 96 

 (69.56 per cent) hatched. The average incubation period was 

 10.208 daj*s; maximum, 15 days; minimum, 8 days. The average 

 time from the time of egg deposition to the appearance of the red 

 ring was 4.754 days; maximum, 9 days; minimum, 3 days. The 

 average time for the appearance of the black spot was 8.368 days; 

 maximum, 14 days; minimum, 6 days. (See Table XXXIX.) 



Table XXXIX. — Length of incubation period, of second-brood eggs, Winthrop, Me., 



1914. 



No. of 

 obser- 

 vation. 



Num- 

 ber of 

 eggs. 



Date- 



Depos- 

 ited. 



Red 



ring. 



Black 

 spot. 



Hatched. 



Appearance of- 



Red 

 ring. 



Black 

 spot. 



Incuba- 

 tion 

 period. 



Number 

 dead. 



Aug. 20 

 Aug. 22 

 Aug. 24 

 Aug. 25 



...do 



Aug. 26 



...do 



Aug. 27 

 Aug. 28 

 Aug. 31 

 ...do.... 

 Sept. 7 

 Sept. 10 

 Sept. 11 

 Sept. 12 



Sept"i3 



Days. 



Days. 



Aug. 29 

 Aug. 30 



Sept. 2 

 ..do 



Sept. 3 



Sept. 1 

 Sept. 4 

 Sept. 5 



Sept. 4 

 Sept. 6 

 ..do 



Sept. 12 

 Sept. 15 



...do 



Sept. 21 



Sept. 19 

 Sept. 21 

 ..do 



Sept. 4 



...do 



Sept. 5 



...do 



Sept. 6 

 Sept. 8 

 Sept. 9 

 Sept. 8 

 Sept. 9 

 Sept. 21 



Sept. 17 



Sept. 22 

 Sept. 21 



Sept. 14 

 Sept. 18 



Sept. 17 

 Sept. 22 



Sept. 20 

 Oct. 2 



Sept. 23 

 Sept. 24 

 Sept. 23 

 Sept. 24 

 Sept. 23 

 Oct. 3 



Average . . . 

 Maximum. 



Minimum . 



5 



8 



5 



8 



7 



9 



5 



6 



5 



12 



5 



11 



4 



10 



9 



10 



4 



8 



3 



6 



4 



14 



4. 754 

 9 

 3 



8. 368 

 14 

 6 



Days. 



10. 208 

 15 



8 



SECOND BROOD OF LARV/E. 



Time of hatching . — As will be noted in Tabic XXXIX, the first of 

 the second-brood larvae hatched September 4. The last of the second- 

 brood larvte hatched October 3. Hence the period of hatching was 

 about one month. 



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

 period waslimited to I individuals. Many of the larvas which entered 

 the fruit failed to mature. The average feeding period was 42.750 

 days; maximum, 17 days; minimum, 38 days. The above records 

 are given in Table XL. 



