LIFE HISTORY OF CODLING MOTH IN PECOS VALLEY, N. MEX. 17 



Larval life in the cocoon. — The length of the period of time which 

 the larvae require to construct a cocoon preparatory to pupation or 

 wintering, is found to vary considerably when large numbers of the 

 larvae are kept under observation. In Table XVI will be found the 

 results of observations on 282 individual insects. Of this number 70 

 larvae required 5 days, and an average period of 5.16 days is found 

 to exist. The maximum time was 17 days; minimum, 1 day. 



Table XVI. — The making of cocoons of the second generation of the codling moth, 

 Roswell, N. Mex., 1912. 



Date of 



Num- 

 ber of 

 individ- 

 uals. 



Length of cocooning period in specified days. 



Aver- 

 age 



days. 



Mini- 

 mum 

 days. 



Maxi- 

 mum 

 days. 



Total 



leaving fruit. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



16 



17 



days. 



July 8 



9. ... 



1 



4 



6 



12 



5 



12 



7 



5 



5 



11 



12 



12 



6 



13 



2 



8 



7 



24 



21 



21 



8 



6 



8 



7 



11 



7 



7 



28 



4 



7 



5 



3 



3 



2 



1 



1 







1 

 1 



























3.0 

 4.5 

 4.3 

 4.2 

 4.0 

 5.2 

 5.4 

 5.6 

 4.8 

 6.4 

 6.0 

 5.3 

 4.8 

 5.8 

 5.0 

 3.7 

 5.6 

 4.8 

 4.3 



3 

 3 

 4 

 2 

 3 

 3 

 4 

 1 

 4 

 3 

 3 



i 



4 

 5 

 2 

 2 

 2 

 1 

 3 

 3 

 4 

 4 



6 

 2 

 "2 

 3 

 2 

 4 

 2 

 2 

 6 

 4 

 4 

 7 

 5 



3 



7 

 5 

 6 

 5 



16 

 7 



12 

 6 



17 

 9 

 7 

 5 



13 

 5 

 6 

 8 



10 

 8 



10 



11 

 8 



12 



12 

 7 

 7 

 7 

 8 

 6 

 8 

 4 

 9 

 7 

 4 

 7 

 5 



3 



2 

 4 

 2 

 3 

 8 

 2 

 1 

 2 

 2 

 1 

 3 

 1 

 4 



'2 



1 

 1 

 1 

 1 

 1 

 2 

 2 

 3 

 5 

 5 

 3 

 2 



"2" 





1 



















18 



10 



















26 



11 





2 



3 



1 

 1 



4 





















50 



12 





















20 



13 







1 

 3 



1 

 1 

 3 

 3 

 2 

















1 





62 



14 







1 















38 



15 



1 















1 









28 



16 



















24 



17 







1 



1 



2 

 2 



2 

















1 



70 



18 









2 













72 



19 















63 



20 

























29 



21 









4 



1 













1 







75 



22 























10 



23 



2" 



2 

 1 

 1 

 2 



"i" 



1 

 3 

 4 

 1 



5 



"i" 



4 



1 



"i" 

 2 



1 





















30 



24 





3 

















39 



25 





1 













19 



26 



2 

 8 

 3 

 1 

 3 



7 

 3 

 2 

 3 



i" 



3 



"i" 



7 

 1 



"3" 



1 



"2" 



5 

 1 

 1 



1 

 2 



1 

 1 















91 



27 





1 













5.4 



113 



28 







1 











6.0 

 5.8 

 6.1 

 7.6 

 4.8 

 4.7 

 4.7 

 5.3 

 4.8 

 4.4 

 3.0 

 8.3 

 5.7 

 4.0 

 7.0 

 5.0 



48 



29 







1 



. 













35 



30 















1 

 1 









49 



31 























53 



Aug. 1 





1 

 1 



2 



"i" 



2 



1 



1 

 3 

 3 

 2 

 4 

 2 



3 



4 

 1 



11 

 1 



1 

















52 



2 



















33 



3 



















33 



4 





1 



2 

















147 



5 

















19 



6 





1 

 2 



"i" 





1 

















31 



7 





















15 



8 





1 



1 



"i" 



1 



1 















25 



9 









1 

 2 

















17 



10 

























8 



11 













1 



















7 



15 











1 





















5 



































Total . 



282 



3 



11 



25 



68 



70 



53 



27 



10 



3 



2 



1 



3 



1 



1 



1 



5.16 







1,457 





i 





THE SECOND BROOD OF PUP^E. 



Time of pupation. — Investigations show the earliest recorded 

 pupation of individuals of this brood to have occurred July 14, and 

 the latest on August 31. Actual pupations are thus shown to cover 

 a period of 48 days. (See Table XVII.) 



Length of pupal stage. — A record on the length of the pupal stage 

 was established from observations with 211 individuals, and reveals 

 the fact that the pupal period varied from 8 to 19 days. The average 

 period was 11.23 days. These records are found in Table XVII. 



