8 



BXJLLETIN 429, U. S. DEPARlMEl^T OP AGEICULTUKE. 



Time of liatching. — By reference to Table V it will be noted that 

 the earhest first-brood eggs hatched May 7, and hatching continued 

 more or less irregularly until June 2, when the last observation was 

 made. Hence, eggs of the first brood were hatching for a period of 

 26 days, and were hatching in largest numbers from May 21 to May 

 26, reaching the maximum number on May 21. 



THE FIRST BROOD OF LARVAE. 



. Length, of feeding period of larvse —The length of feeding period of 

 larvae of the first brood was determined from observations with 51 

 individuals as given in Table V. The average length of feeding was 

 21.52 days; maximum, 27 days; minimum, 15 days. In this in- 

 stance the wintering larvse were not isolated from transforming 

 larvse of the same brood. 



Table V. — Length of feeding period of larvx of the first hrood of the codling moth, Ros- 



well, N. Mex., 1912. 



Date of 



Num- 

 ber of 

 indi- 

 vidu- 

 als. 



Length of feeding in specified days, being the time from 

 hatching of egg to the leaving of fruit by larvae. 



Aver- 

 age 

 days. 



Mini- 

 mum 

 days. 



Maxi- 

 mum 

 days. 



Total 



days. 





15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



May 7 



8 . 



2 

 1 

 3 

 4 

 4 



18 

 2 

 5 

 9 

 1 

 1 

 1 



























2 



.27 

 .24 

 23.6 

 23.25 

 22.5 

 20.6 

 22 



22.2 

 19.3 

 23 

 20 

 24 



27 

 24 

 22 

 21 

 17 

 15 

 21 

 19 

 16 

 23 

 20 

 24 



27 

 24 

 26 

 27 

 25 

 27 

 23 

 25 

 22 

 23 

 20 

 24 



54 





















1 







24 



12 

















1 



1 





1 



"\ 



71 



17 















2 



1 

 2 





93 



20. . . 







1 



2 













1 



1 





90 



21 



22. 









4 



1 



3 

 1 

 2 

 1 



1 



2 

 1 



1 



1 



370 



44 



23. . . 











1 

 1 



2 





2 







111 



26 









2 



2 











174 



30. 



1 











23 















1 















20 



9 



















1 









24 

































51 



1 



2 



3 



2 



6 



4 



9 



4 



5 



5 



4 



2 



4 



21. 52 







1,098 











Larval life in the cocoon. — -The larval fife in the cocoon is generally 

 considered .to be the time required for making the cocoons, and is 

 calculated from the time a transforming larva leaves the fruit until 

 the time of pupation. The results of 41 observations show the 

 average time consumed in constructing the cocoon as 5.24 days. The 

 maximum time was 12 days; minimum, 2 days. These records may 

 be found in Table VI. 



