116 BULLETIN 932, U. S. DEPARTMENT OF AGRICULTURE. 



to the time of the appearance of the red ring was 2.70, the maxi- 

 mum 9, and the minimum 1 ; the average number of days from the 

 date of deposition to the black-spot stage was 6.62, the maximum 

 13, and the minimum 4; the average incubation period was 9.14 days, 

 the maximum 15, and the minimum 6. In 1916 the average number 

 of days from the date of deposition to the appearance of the red 

 ring was 2.62, the maximum 10, and the minimum 1; the average 

 appearance of the black spot from the time of egg deposition was 

 6.68 days, the maximum 11, and the minimum 5; the average incu- 

 bation period was 7.32 days, the maximum 14, and the minimimi 6. 



Length of feeding period of the first-brood larvm, stock-jar 

 method. — During the season of 1915, the length of the feeding 

 period averaged 21.64 daj'S, the maximum was 35, and the minimum 

 12. In the following year the average length of the feeding period 

 was 20.19 days, the maximum 42, and the minimum 14. 



Length, of feeding period of the first-brood larvce, bagged-fruit 

 method. — The records in 1915 give an average feeding period of 22.77 

 days, a maximum of 35, and a minimum of 15. In 1916 the average 

 feeding period was 21.10 days, the maximum 29, and the minimum 17. 



Length of cocooning period of larvce of the first brood. — As shown 

 by the observations in 1915, the average cocooning period was 6.70 

 days, the maximum 28, and the minimum 1. In the following sea- 

 son the average cocooning period was 5.53 days, the maximum 30, and 

 the minimum 2. 



Length of pupal stage of the first brood. — The average length of the 

 pupal stage, first brood, in 1915 was 11.44 days, the maximum 31, and 

 the minimum 6; in the succeeding year the average length was 11.23 

 'days, the maximum 19, and the minimum 6. 



Oviposition by moths of the first brood. — As shown by the studies 

 in 1915, the average number of days before oviposition was 2.07, the 

 maximum 5, and the minimum 1 ; the average number of days from 

 the first to the last oviposition was 16.78, the maximum 25, and the 

 minimum 7 ; the average number of days from date of emergence to 

 last oviposition was 17.85, the maximum 26, and the minimum 10. 

 The summarized data for 1916 are as follows : The average number of 

 days from the date of emergence to the first oviposition was 2.21, the 

 maximum 5, and the minimum 1 ; the average number of days from 

 the first to the last oviposition was 12.69, the maximum 20, and the 

 minimum 1; the average number of days from the time of emer- 

 gence to the last oviposition was 13.63, the maximum 20, and the 

 minimum 5. 



Number of eggs per female moth of the first brood. — The moths of 

 the first brood of 1915 deposited 46.73 eggs per female moth. In the 

 following year the female moths deposited an average of 43.98 eggs. 



