6 



BULLETIN 252, U. S. DEPARTMENT OF AGRICULTURE. 



Table II. — Length of the pupal stage of spring-brood pupse, Winthrop, Me., 1913. 



Num- 

 ber of 



Date of 



pupa- 

 tion. 



Length of the pupal stage in specified days. 



indi- 

 viduals. 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



28 



29 



31 





1 



May 17 

 May 25 

 May 26 

 May 2S 

 May 29 

 May 30 

 May 31 

 June 1 

 June 2 

 June 3 

 June 4 

 June 5 

 June 6 

 June 7 

 June 8 

 June 9 

 June 10 

 June 11 

 June 12 

 June 13 

 June 14 

 June 15 

 June 16 

 June 17 

 June 18 

 June 19 

 June 20 

 June 21 

 June 22 

 June 23 

 June 24 

 June 25 

 June 26 

 June 27 

 June 2S 

 June 29 

 June 30 

 July 1 















































1 



2 

































2 

















2 





































2 











1 































1 

















2 





























2 

 2 

 3 



4 

 2 

 9 



10 

 19 

 4 

 8 

 1 

 1 



















2 















































4 



























1 

 8 

 3 

 5 



17 

 11 

 36 

 11 

 6 

 1 





















16 

























2 

 1 

 3 

 2 

 8 

 3 

 12 

 4 

 6 

 4 

 5 



2 

 2 



















8 



































. 







18 



































1 

 1 



Y 





37 























1 

 1 



4 







1 

 1 



1 



"i" 



1 



Y 





42 

























47 























2 





1 





35 



















1 



1 



1 

 2 

 2 



10 

 13 



16 



1 

 1 

 1 

 1 











13 



































10 









































18 













1 







2 

 2 

 1 

 1 

 12 

 15 

 4 

 9 



"2" 

 2 



1 

 4 

 9 

 13 

 9 

 4 

 8. 





















26 



















1 















1 







27 















1 



.... 

















17 















1 

























22 







































21 





1 







































16 













1 

 3 

 8 

 4 

 2 

 2 







2 





















12 







































16 













1 



4 

 2 

 2 

 6 

 4 

 1 

 1 



3 





























8 







































10 











2 



2 































9 







1 













































1 







































3 

 1 



.... 



1 





























3 









































3 











2 

 Y 



1 































4 









i 



"i* 



2 

 2 



"3" 









1 



























8 



Y 



1 





4 



1 



Y 

































3 



































4 



1 

































1 











































3 













1 





1 

 1 



1 





























1 



July 3 

 July 7 



aupae 











































1 











1 

 6 





































4 S3 



1 



2 



1 



2 



16 



27 



23 



55 



53 



52 



51 



99 



68 



11 



2 



1 



2 



5 



1 



T 



1 



1 



Average length of the pupal stage, 19.03 days. 

 Maximum length of the pupal stage, 44 days. 

 Minimum length of the pupal stage, 9 days'". 



SPRING BROOD OF MOTHS. 



Time of emergence of moths. — The first of the spring-brood moths 

 emerged June 18, about two weeks after the petals dropped. The 

 maximum emergence of moths occurred June 27 — one month after full 

 bloom. The last of the spring-brood moths issued July 20. The 



emergence record of 514 moths is given hi Table III. 

 Table III. — Timeof emergence of moths of the spring brood, Winthrop. Me. 



fig. 2.) 



1913. {See 



Date of 

 emer- 

 gence. 



Number 

 of moths. 



Date of 

 emer- 

 gence. 



Number 

 of moths. 



Date of 

 emer- 

 gence. 



Number 

 of moths. 



Date of 

 emer- 

 gence. 



Number 

 of moths. 



June 18 

 June 20 

 June 21 

 June 22 

 June 23 

 June 24 

 June 25 

 June 26 



2 

 5 



10 

 15 

 14 

 25 

 43 

 25 



June 27 

 June 2S 

 June 29 

 June 30 

 i July 1 

 : July 2 

 July 3 

 July 4 



74 

 27 

 39 

 32 

 50 

 35 

 16 

 34 



July 5 

 Julv 6 

 July 7 

 July 8 

 July 10 

 Julv 11 

 July 12 

 JulV 13 



10 

 14 

 14 

 5 



3 



4 

 4 



July 15 

 July 18 

 July 



Total. 



4 

 1 

 2 



514 



