LIFE HISTORY OF CODLING MOTH IN PECOS VALLEY, N. MEX. 6 



The second generation includes: 



The second brood of eggs; 



The second brood of larvx, which includes both transforming larvae and wintering 

 larvae; 



The second brood of pupse, resulting from transforming larvae; 



The second brood of moths, which emerge from pupae of the same generation. 

 The third generation includes: 



The third brood of eggs; 



The third brood of larvx, which includes both transforming larvae and wintering larvae: 



The third brood of pupse, resulting from the transforming larvae; 



The third brood of moths, which emerge from pupae of the same generation. 

 The fourth generation (not complete) includes: 



The fourth brood of eggs; 



The fourth brood of larvx; none of these larvae transform until the following spring. 



SEASONAL-HISTORY STUDIES OF 1912. 



The rearing material in the spring of 1912 consisted of a consid- 

 erable number of overwintering larvae which had been collected at 

 random in near-by orchards. About 500 larvae were collected in 

 January and early March, and later in March and in early April several 

 thousand more were secured from the same source. Some 500 larvae 

 were transferred to " pupation sticks" (figs. 6, 7) for pupal observa- 

 tion, but the mortality among them was unduly high and many of 

 them failed to withstand the transfer and reconstruction of cocoons. 

 The overwintering larvae in the spring were found in poor condition, 

 many being small and feeble, and even in the field a number of dead 

 ones were found in the cocoons. 



A supply of larvae was transferred from the field station at Douglas, 

 Mich., both for the purpose of introducing the parasitic hymenop- 

 terous fly Ascogaster carpocapsae Vier., and to compare the time of 

 emergence of the moths with specimens native to Roswell, N. Mex. — 

 a point of interest in view of the frequent extensive shipment of 

 larvae into localities of variable conditions. 



THE SPRING BROOD. 



PUPATION OP SPRING BROOD. 



The few observations taken on the pupal stage of the spring orood 

 are not sufficient for conclusions as to the exact length of the pupal 

 stage, nor the degree of variation in the spring brood of pupae. The 

 earliest pupa was found in the field March 15, and the earliest moth 

 appeared in cages from field-collected material April 12, the pupation 

 period being approximately 31 days. Fully 50 per cent of the insects 

 were pupae in the field by April 2, and on May 5 about one-half of 

 the moths had emerged, which shows that the pupal stage for most 

 individuals was about one month. The pupal stage during the 

 latter half of the pupal period was much shorter. Records of seven 

 individuals from March 22 to May 14, give an average of 24.4 days for 

 the pupal stage. 



