22 



BULLETIN" 429, IT. S. DEPARTMENT OF AGRICULTURE. 



Length of life of moths. — Observations in this connection were made 

 with a total of 1,416 moths confined in cages in order to secure 

 mortality records. The results obtained with this number of indi- 

 vidual moths give the average length of life of male moths to be 

 5.49 days; female moths, 7.58 days; maximum length of life of male 

 moths, 12 days; female moths, 24 days; the minimum length of life of 

 moths of both sexes is identical, 2 days. These records may be found 

 in Table XXI. 



Table XXI. — Length of life of male and female codling moths of the second brood. 

 Summaiy of records of 1,416 individual moths, Roswell, JV. Mex., 1912. 



Male. 



Female. 



Length of life. 



Number 



of 

 moths. 



Length of life. 



Number 



of 

 moths. 



Days. 

 2 



3 



54 



132 



165 



151 



90 



40 



9 



8 



3 



4 



























Days. 

 2 



4 

 11 



38 



147 

 163 

 118 



66 

 53 

 33 



25 



8 

 8 

 4 

 2 

 1 



3 



3 



4 



4 



5 



5 



6 



6 



7 



7 



8 



8 



9 



9 



10 



10 



11 



11 



12 



12 



13 



13 



14 



14 



15 



15 



16 



16 



17 



17 



24 



24 







Average length of life, of male moths, 5.49 days; average length of life of female moths, 7.58 days; maxi- 

 mum length of life of male moths, 12 days; maximum length of life of female moths, 24 days; minimum 

 length of life of male moths, 2 days; minimum length of life of female moths, 2 days. 



LIFE CYCLE OF SECOND GENERATION. 



In order to secure accurate data on the length of the life cycle of the 

 codling moth of the second generation, observations were conducted 

 by means of which the length of time from the date of egg deposition 

 to emergence of moth could be determined. A total of 283 individual 

 moths were used in this test, and the results show a range of varia- 

 tion in the life cycle from 32 to 68 days, with an average period of 

 41.26 days. These results are shown in Table XXII. 



