30 



BULLETIX 252, U. S. DEPARTMENT OF AGRICULTURE. 



Length of the pupal stage. — In Table XXIV the length of the pupal 

 stage of 196 spring-brood pupa? is given. The average length of the 

 pupal stage was 22.581 days; maximum, 44 days; minimum, 11 days. 



Table XXIV. — Length of pupal stage of spring-brood pupae, Winthrop, Me., 1914. 



Num- 

 ber of 

 indi- 

 viduals. 



Date of 

 pupa- 

 tion. 



Length of pupal stage in specified days. 



11 



12 



14 15 16 



18 



19 



20 21 22 



1 



23 



24 



25 



26 27 



28 29 



1 



30 



31 



1 

 32 33 



So 



43 



44 



1 



1 

 1 



3 

 3 

 1 

 3 

 8 

 3 



9 



4 



6 



15 



16 



20 



18 



14 



4 



4 



3 



5 



2 



4 



11 



6 



6 



10 



1 



4 



1 



1 



May 25 

 Mav 26 

 May 28 

 May 29 

 May 30 

 May 31 

 June 1 

 June 2 

 June 3 

 June 4 

 June 6 

 June 7 

 June 8 

 June 9 

 June 10 

 June 11 













1 



































l 











































1 

 2 































1 



T 



1 

 1 

 2 























... : 









l 



1 







































































1 





















. ... 













i 

 l 



2 

 1 



1 



2 



1 

























...i i 









1 



3 

























1 

























1 

















1 



2 































1 

 3 



3 



2 









...... 



1 













' 







"i" 



1 



T 





























y 



4 

 3 

 2 

 5 

 1 



2 

 2 



2 



2 "i 



5 2 



8 3 



9 2 



3 2 

 2 1 



... 1 

 ... 1 



1 1 















" ' ". 













. !-- i 







1 













2 



i 



1 



1 











1 











1 



i ... 











1 

 1 



1 





1 









June 13 

 June 14 

 June 15 

 June 16 

 June 17 

 June 18 

 June 20 

 June 21 

 June 22 

 June 23 

 June 24 

 June 25 

 June 26 

 June 28 

 July 1 

 July 5 

 July 6 











1 





9 





" 















l 









1 





1 











I . 





:::::: 





















2 



2 



1 







- -|- - 















































1 



... i ... 





1 







1 













... l 







1 



. ... 







! 













1 







1 3 

 5 4 



2 "2 



2 2 



3 1 2 





























l | l 





































1 



1 



T 















...... 



















1 





...... 























l 



1 





... . 



















1 

































l ... 



3 

 1 

 1 





































i 





















































1 



... l 















































196] 



Dupse 



1 



2 



3 4 - 



7 1 1 ■ 9 21 24. 



13 



35 40 



14 3 



6 2 14 1 



,.|i|. 



1 



1 



Average length of the pupal stage, 22.581 days. 

 Maximum length of the pupal stage, 44 days. 

 Minimum length of the pupal stage, 11 days. 



SPRING BROOD OF MOTHS. 



Time of emergence of moths. — In Table XXV is shown the emer- 

 gence record of 210 spring-brood moths. On June 14 moth emergence 

 commenced and continued until July 19. The maximum emergence 

 occurred July 7, on which date 28 moths appeared. In 1913 the time 

 of moth emergence extended from June 18 to July 20. In 1914 the 

 date of full bloom (Baldwin) was the same as in 1913, namely, 

 May 28. 



