LIFE HIST-OKY OF CODLlNtJ MOTH IJ^T PECOS VALLEY, IST. MEX. 73 



THIRD BROOD OF PUP^. 



Lengtli of pwpal stage. — The observations made on the length of the 

 pupal stage of the third brood, as found m 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 sho-^ii to be 17 days and the mmimum 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 precedmg brood, 

 11.6 da^'s, and is exceeded only slightly by the correspondmg average 

 for the fii"st 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, RosweU, N. Mex., 1913. 



Date of egg 



Num- 

 ber of 

 indi- 

 \'idua]s. 



Length of pupal stage in days. 



Aver- 

 age 

 days. 



Mini- 

 mum 



days. 



Maxi- 

 mum 

 days. 



Total 



deposition. 



7 



S 1 9 



10 



U 



12 



13 1 14 



15 



16 



17 



days. 



Jul V 10 



12 

 1 



14 

 19 



11 



15 

 2 

 9 



12 

 1 

 S 



16 

 8 

 5 

 2 

 4 

 7 

 6 

 4 

 5 

 2 

 1 

 7 

 2 







2 



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 

 S 

 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 



U 







1 

 3 



8 

 7 

 5 



7 

 6 

 2 

 1 

 2 

 1 

 3 

 3 

 1 

 1 

 1 



2 

 1 

 1 

 2 

 2 













154 



15 















196 



It; 

















77 



17 



















124 



l"- 







2 











167 



19 















22 



20 









3 



4 



3 

 2 













109 



21 







2 





1 



131 



22 













11 



23 









1 

 3 

 1 



1 



4 

 5 

 3 













91 



24 







2 



1 













183 



25 .. 







1 



1 





93 



26 













61 



27 







1 









20 



28 











1 



1 

 1 

 2 

 3 









53 



29 



1 







1 



1 



"2" 









86 



30 







74 



31 



1 





1 

 1 







48 



Aug. 1 

















65 



3 .. 

















28 



5 



















13 



6 









1 









3 



2 





100 



11 











2 



24 













53 



19 



11 



7 



4 



1 







180 



1 



1 



15 



37 



11.4 







2,062 











LENGTH OP LIFE CYCLE. 



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

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

 through tlie several stages in 34 days, this beuig the shortest time 

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

 and tliat an avorngo of 43.11 days is found for the entire number. 

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

 j)r('vious generations i.s shown to be 1.71 days greater than the corre- 

 sponding ])('riod Tor the second brood and 3.8 days shortei" tluiii the 

 same jxTiod lor the fii'st gciicfalion. Tlic iivcrngc! pciiod for the 

 leiigt-h (»r llic, \\U\ cylc lor tlic lliird gcneriilioii dining I!>I2 wiis 

 48..')? d;i\s, ii difl'crcnce ol' 5.16 (hi\s. 



