36 



BULLETIN 252, U. S. DEPARTMENT OF AGRICULTURE. 



Length of the feeding period of wintering first-brood larvse (stocJc-jar 

 method). — Observations were taken on the length of feeding of 341 

 larvae, as is given in Table XXXI. The average length of the feeding 

 period for all larvse was 25.717 days; maximum, 46 days; minimum, 

 19 days. The average length of feeding for the male larvae was 

 23.935 days; for the female larvae, 27.022 days. The maximum length 

 of the feeding period for the male larvae was 46 days; for the female 

 larvae, 46 days. The minimum length of the feeding period for the 

 male larvae was 19 days; for the female larvae, 19 days. 



Table XXXI. — Length of feeding period of the wintering larvs? of the first brood, stock- 

 jar method, Winthrop, Me., 1914. 



[Figures in parentheses ( ) denote sex undetermined.] 



Number of 

 indiyiduals. 



Date of 



entering 



fruit. 



Length of feeding period in specified days. 



19 



20 



21 



22 



23 



u 



25 26 



c? 



9 



S 



9 



S 



9 



e 



9 



S 9 



C? 



9 



c? 



?L 



9 



2 



July 7 

 July 8 

 July 9 

 July 11 







l 











1 



4 







1 









l 





l 







l 



2 





















l 







1 









l 

 l 

 l 

 l 







i ...J i 











4 



July 12 ! 1 1 

 July 13 



.... 



1 



i .... 













3 







(1) 



T '(ij 





9 



July 14 

 July 15 

 July 16 

 July 17 

 July 18 

 July 19 

 July 20 

 July 21 

 July 22 

 July 23 

 July 24 

 July 25 

 July 26 

 July 28 

 July 29 

 July 31 

 Aug. 1 

 Aug. 2 

 Aug. 3 

 Aug. 4 

 Aug. 5 

 Aug. 6 

 Aug. 8 

 Aug. 9 





:::::: 









_ _ .. 



1 

 1 



14 











1 ...J 2 3 



9 .. 









1 

 1 



l 



l 



18 









1 ;.... 



2 1 2 



2 



11 



1 . 



i 



11 2 







19. 



1 





------- 



1 

 1 

 1 

 1 



1 j 2 



i m 





3... 







...J 1 



1 





20 







! 



....(1)2 



ij... 



4 

 1 







6 



6 



11 



33 



4 



9 



10 



1 i 







i ...: 



1 



1 



....j... ...... 







21 1 



"4 2 



1 



! 







•H 1 . ;;; 





.... 



i 



i i 



1 



1 





1 



3 



i | (i) im 



....i ...... 







1 i i 



.... 2 











(i) 







i L___ 



2 







i 















1 



1 



3 1 2 





2 



19 











1 

 3 



1 



4 





3 1 

 2 1 



1 

 2 



4 



3 1 

 3 .... 





24 







1 



(i) 



4 | 4 

 3 \ 2 

 1 5 



1 



.... 



1 



1 

 1 

 2 



16 



40 



13 



10 



5 



10 



2 



341 c? and 9 . . . 







1 ! 2 J 3 



2 ! r21 1 







1 



i 



1 

 1 



3(1) 

 (1) 

 2 



1 



1 



i 



! 







(1) - .-- 11 













3 





1 2 













1 





1 



9 



1 



2 





















1 1 



3 



















-------- 



4 



3 



13 



~ 



14 6 



IF 



21 28 i 36 17 1 22 : 8 



~i7 



Sex undetermined 



Total 





1 



1 1 







1 







3 



1 



2 



4 2 

















































