CODLING MOTH IN COLORADO. 117 



Length of life of moths of the first brood. — In 1915 the average 

 length of life of the male moths was 11.86 days, the maximum 41. and 

 the minimum 1 ; the average life of the female moths was 12.68 days, 

 the maximum 35, and minimum 1. In 1916 the summarized figures 

 give 13.12 and 12.20 days as the average length of life of the male and 

 female moths respectively. The maximum life of the male moths was 

 38 days and of the female 26 clays ; the minimum length of life of both 

 the male and female moths was 1 day. 



Life cycle of the first generation. — The average life cycle as 

 obtained by rearing individuals from the egg to the adult stage, 

 stock-jar feeding method, in 1915 was 49.30 days, the maximum 72. 

 and the minimum 38. According to the bagged- fruit feeding 

 method, the average life cycle was 49.18 days, the maximum 74. and 

 the minimum 36. To obtain the complete life-cycle add 2.07 days, 

 which was the average time from the emergence of the moths to the 

 deposition of the first egg. In 1916 the average life cycle, stock- jar 

 feeding method, was 44.89 days, the maximum 77, and minimum 36 ; 

 and the average complete life cycle, obtained by adding 2.21 days to 

 the life cycle, was 47.10 days. The average life cycle, bagged-fruit 

 feeding method, was 46.37 days, the maximum 66, and minimum 38. 

 The average complete life cycle was 48.58 days. 



THE SECOND GENERATION 



Embryological changes and length of the incubation period of 

 second-brood eggs. — In 1915 the average number of days from the 

 deposition of the egg to the appearance of the red ring was 1.85, 

 the maximum 4, and the minimum 1 ; the average time for the ap- 

 pearance of the black spot was 5.54 days, the maximum 8, and mini- 

 mum 3 ; the average incubation period was 7.22 days, the maximum 

 11, and minimum 6. In the next year the average appearance of 

 the red-ring stage was 2.06 days after egg deposition, the maximum 

 3, and minimum 1. The average appearance of the black spot was 

 5.80 days, the maximum 7, and minimum 5. The length of the 

 incubation period averaged 6.93 days, the maximum 10, and mini- 

 mum 6. 



Length of feeding period of second-brood larva. — The average 

 length of the feeding period in 1915 was 28.69 days, maximum 67, 

 and the minimum 15. In 1916 the average length of the feeding 

 period was 28.61 days, the maximum 70, and the minimum 14. 



Length of cocooning period of larva of second brood. — In 1915 the 

 average length of the cocooning period was 9.35 days, the maximum 

 31, and minimum 3. In the following year the average number of 

 days for the construction of the cocoon was 4.80, the maximum 14,. 

 and minimum 2. 



