LIFE HISTORY OF CODLING MOTH IK PECOS VALLEY, N. MEX. 73 



THIRD BROOD OF PUP/E. 



Length of jiupal stage. — The observations made on the length of the 

 pupal stage of the third brood, as found in Table LIII, show that of 

 the entire number of 180 individuals accounted for, 53 of that number 

 completed the pupal period in 11 days. The maximum length of the 

 stage is shown to be 17 days and the minimum time 7 days. The 

 average is found to be 11.4 days and this is practically identical in 

 length with that of the corresponding period of the preceding brood, 

 11.6 days, and is exceeded only slightly by the corresponding average 

 for the first brood, namely, 11.76 days. The average pupal period 

 for the spring brood, 22.97 days, is found to be almost twice as long 

 as that of succeeding generations of the same season. 



Table LIII. — Length of pupal stage of the codling moth in days of all individuals 

 developing from eggs deposited on specified dates, third brood, Roswell, N. Mex., 1913. 



Date of egg 



Num- 

 ber* of 

 indi- 

 viduals. 



Length of pupal stage in days. 



Aver- 

 age 

 days. 



Mini- 

 mum 

 days. 



Maxi- 

 mum 

 days. 



Total 



deposition. 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



days. 



July 10 



12 

 1 



14 



19 

 7 



11 



15 

 2 

 9 



12 

 1 

 8 



16 

 8 

 5 

 2 

 4 

 7 

 6 

 4 

 5 

 2 

 1 

 7 

 2 







2 



7 

 1 

 2 

 8 

 1 

 1 

 2 



2 



1 













10.1 

 10.0 

 11.0 

 10.3 

 11.0 

 11.2 

 11.1 

 11.0 

 12.1 

 10.9 

 11.0 

 11.3 

 11.4 

 11.6 

 12.2 



10.0 



13.2 

 12.2 

 12.3 

 12.0 

 13.0 

 14.0 

 13.0 

 14.2 

 12.0 



9 

 10 

 9 

 9 



10 

 10 

 9 

 11 

 10 

 9 

 11 

 10 

 9 

 9 



10 



9 



13 



7 



8 



9 



11 



13 



13 



10 



12 



12 

 10 

 13 

 12 

 12 

 13 

 13 

 11 

 17 

 14 

 11 

 12 

 16 

 14 

 14 

 11 

 14 

 16 

 15 

 14 

 14 

 15 

 13 

 16 

 12 



122 



13 

















10 

 154 

 196 



77 



14 . 







1 



3 



8 

 7 

 5 



6 

 2 

 •1 



2 

 1 

 3 

 3 

 1 

 1 

 1 



2 

 1 

 1 

 2 

 2 



1 











15 















16 

















17 









1 

 3 











124 



18 







2 











167 



19 















22 



20 









3 



4 



3 

 2 







1 





1 



109 

 131 



21 







2 



1 



1 



22 













11 



23 









1 

 3 

 1 

 1 



4 

 5 

 3 













91 

 183 



24 







2 

 1 



2 



1 

 2 







1 





25 







1 



1 





93 

 61 

 20 



26 













27 







1 









28 









3 



1 

 1 



1 

 1 

 1 

 2 

 3 









53 



29 



1 







1 



1 



~~2 



1 

 1 



1 





86 

 74 



30 :.... 



1 





31 



1 





1 

 1 







48 



Aug. 1 







1 



.... 



1 

 1 









65 



3 











1 







28 



5 



















13 



6 









1 









3 



2 





100 

 24 



11 











2 



























180 



1 



1 



15 



37 



53 



31 



19 



11 



7 



4 



1 



11.4 







2,062 











LENGTH OF LIFE CYCLE. 



A study of Table LIV will show that of 185 individual insects 

 which completed the life cycle of the third generation, two passed 

 through the several stages in 34 days, this being the shortest time 

 recorded. Also that one insect required a maximum time of 58 days, 

 and that an average of 43.11 days is found for the entire number. 

 This period in comparison with the average length of life cycle of 

 previous generations is shown to be 1.71 days greater than the corre- 

 sponding period for the second brood and 3.8 days shorter than the 

 same period for the first generation. The average period for the 

 length of the life cycle for the third generation during 1912 was 

 48.57 days, a difference of 5.46 days. 



