30 



BULLETIN 429, U. S. DEPARTMENT OF AGRICULTURE. 



Table XXVII. — Pupal stage of the third brood of the codling moth, Roswell, 



N. Mex., 1912. 



Date of pupation. 



Num- 

 ber of 

 indi- 

 viduals. 



Length of pupal period in speci- 

 fied days, being the time from 

 pupation to emergence of moth. 



Aver- 

 age 



days. 



Mini- 

 mum 

 days. 



Maxi- 

 mum 

 days. 



Total 

 days. 





11 



12 



13 



14 



15 



17 



19 



20 



Aug. 19 



1 

 1 

 1 

 1 

 2 

 1 

 2 

 2 

 3 

 1 

 1 

 1 

















1 



20 



11 



11 



12 



14 



15 



14 



13 



17.33 



15 



19 



17 



20 

 11 

 11 

 12 

 13 

 15 

 14 

 13 

 13 

 15 

 19 

 17 



20 

 11 

 11 

 12 

 15 

 15 

 14 

 13 

 20 

 15 

 19 

 17 



20 



23 



1 

 1 















11 



Sept. 1 

















11 



2 



1 















12 



3 



1 





1 



1 







28 



4 







------ 





15 



5 









2 









28 



6 







2 



1 











26 















1 



1 



52 



8... 









1 





15 



9 













1 





19 



10 













1 



17 





















Total 



17 



2 



1 



4 



2 



3 



1 2 1 2 



14.94 







254 

















THE THIRD BROOD OF MOTHS. 



Time of emergence. — The limited number of moths with which the 

 observations found in Table XXVIII were made is in proportion to 

 the decreasing number of transforming larvae as the season pro- 

 gressed. Emergence began September 3, and continued until 

 September 28, thus covering a period of 25 days. 



Table XXVIII. — Time of emergence of moths of the third brood, Roswell, N. Mex., 1912. 



Date of 

 emergence. 



Number 

 of moths. 



Sept. 3 



4 



• 8 



12 



14 



16 



18 



19 



20 



23 



26 



27 



28 



Total 



1 

 1 

 1 

 1 

 1 

 1 

 2 

 5 

 1 

 1 

 1 

 2 

 1 



19 



LIFE CYCLE OF THIRD GENERATION. 



While the number of individual insects under observation to deter- 

 mine the length of life cycle of the third generation is notably smaller 

 than in previous corresponding cases a sufficient number were 

 observed to determine the length of the period very satisfactorily. 

 The range of variation was found to be from 36 to 62 days, the great- 

 est number, 3, having 48 days An average of 48.57 days is indicated 

 for the third brood, as compared with 41.26 days for the corre- 

 sponding period of the second brood, and 51.14 days for the first 

 brood. (See Table XXIX.) 



