18 



BULLETIN 252, TJ. S. DEPARTMENT OF AGRICULTURE. 



Table XII. — Length of feeding period of wintering larvse of the first brood, bagged-fruit 

 method, Winthrop, Me., 1913 — Continued. 





Date of 



entering 



fruit. 



Length of feeding period in specified days. 



Number of 

 individuals. 



40 



41 



42 



43 



44 46 



47 



49 





J 



9 



s 



9 



3 



9 



S 



9 



3 



9 



<?. 



9 



s 



9 



S 



9 



l 



July 3 

 July 4 

 July 5 

 July 6 

 July 7 

 July 8 

 July 9 

 July 10 

 July 11 

 July 12 

 July 13 

 July 14 

 July 15 

 July 16 

 July 17 

 July 20 

 July 22 

 July 23 

































17. . 















2 



















10. .. 



















i 













11... 









l 





















::::::: 





22 































19 





























........ 





29. 





























. ... 

































. i .. 





12. . 































10 





....... 





























24 



1 

































11 

































10 













l 



l 























4. . 









l 





















1 





15 















l 





l 



1 









8 



















i 











11 





















i 







i 





7 



























i 



































236 <? and 9 



1 







2 





2 



2 







l 





i 



1 



.... i 





Sex undetermined 















1 

















Total 



1 



2 



'?■ ">■ 





j 



1 1 





































Average length of feeding period, 236 male and female larvse, 32.572 days; 93 male larvse, 29.182 davs; 

 126 female larva?, 35.492 days. 



Maximum length of feeding period, 236 male and -female larvae, 49 days; 93 male larvae, 49 days; 126 

 female larvae, 46 days. 



Minimum length of feeding period, 236 male and female larvae, 19 days; 93 male larvae, 24 days; 126 

 female larvae, 19 days. 



It will be noted that the larvse which transform during the same 

 season as hatched have y . upon an average, a shorter feeding period 

 than those which do not transform until the following spring. The 

 average feeding period for 30 transforming larvse of the first brood 

 was 23.432 days; the average feeding period for 886 wintering larvse 

 of the first brood was 27.884 days. It will be further noted that in 

 every instance, except one (Table VII), the average feeding period 

 of the female larvse was longer than that of the male. In the ex- 

 ception cited the result is not considered conclusive, owing to the 

 small number of observations. 



Larval life in the cocoon. — The time of making the cocoon is cal- 

 culated from the time a transforming larva leaves the fruit until it 

 has pupated. The average time consumed in constructing the 

 cocoon was 6.566 days; maximum, 13 days; minimum, 2 days. (See 

 Table XIII.) 



