CODLING MOTH IN NORTHWESTERN PENNSYLVANIA. 



79 



to July 15. Considering, however, the above observations on oviposi- 

 tion and the time of emergence of the first moths, it can closely and with 

 some degree of accuracy be estimated that eggs were laid in the field 

 from about June 17 to about July 22. 



Length of life of the moth. — Records were kept relative to the length 

 of life of the moths which were confined in jars for oviposition. The 

 results of these observations are given in Table IX, with a summary 

 in Tables X and XI showing the extent of variation in the length of 

 life of 161 moths. 



Table IX. — Length of life of moths of the spring brood in rearing cages. 





Date of— 







Date of— 





Number 

 of moths. 





Days. 



Number 

 of moths. 





Days. 



Emer- 



Death. 



Emer- 



Death. 





gence. 









gence. 







6 



June 21 



July 2 



11 



1 



June 25 



July 12 



17 



3 



...do 



July 4 



13 



1 



...do 



July 14 



19 



2 



...do 



July 7 



16 



5 



June 29 



July 10 



11 



6 



June 22 



July 2 



10 



2 



...do 



July 11 



12 



3 



...do 



July 3 



11 



5 



...do 



July 12 



13 



1 



...do 



Julv 9 



17 



2 



...do 



July 13 



14 



21 



June 23 



July 2 



9 



2 



...do 



July 14 



15 



2 



...do 



July 3 



10 



2 



...do 



July 15 



16 



4 



...do 



July 4 



11 



5 



...do 



July 16 



17 



6 



...do 



July 5 



12 



4 



July 1 



July 11 



10 



5 



...do 



July 10 



17 



5 



...do 



July 12 



11 



1 



...do 



July 12 



19 



2 



...do 



July 13 



12 



10 



June 24 



July 1 



7 



3 



...do 



July 15 



14 



4 



...do 



July 5 



11 



1 



...do 



July 16 



15 



2 



...do 



July 7 



13 



4 



July 5 



July 12 



7 



10 



June 25 



July 2 



7 



2 



...do 



July 14 



9 



7 



...do 



July 5 



10 



2 



...do 



July 16 



11 



7 



...do 



July 6 



11 



1 



...do 



July 20 



15 



4 



...do 



July 7 



12 



1 



...do 



July 22 



17 



1 



...do 



July 9 



14 



2 



July 7 



July 16 



9 



1 



...do 



July 10 



15 



1 



...do 



July 17 



10 



1 



...do 



July 11 



16 



1 



...do 



July 22 



15 



Table X. — Length of life of moths of the spring brood. Summary of Table IX. 







Days for 







Days for 



Number 



Days per 



total 



Number 



Days per 



total 



of moths. 



moth. 



number 

 of moths. 



of moths. 



moth. 



number 

 of moths. 



24 



7 



168 



6 



15 



90 



25 



9 



225 



5 



16 



80 



20 



10 



200 



13 



17 



221 



36 



11 



396 



2 



19 



38 



14 

 10 



12 

 13 



168 

 130 









161 





1,800 



6 



14 



84 







Table XI. — Length of life of moths of the spring brood. Summary of Table IX. 



Observations. 



Days. 





11.18 

 19 



7 









It is evident from this table that the greater number died shortly 

 after the first week after emergence. On an average the moths lived 

 11 days; 2 moths lived 19 days and 24 moths lived 7 days. 



