316 Trcms. Acad. Sci. of St. Louis. 



The average for these figures is 344, which is greater 

 than the corresponding number for last year by 52. 



4. THE RELATION OF EAELY OR LATE EMERGING TO THE NUM- 

 BER OF EGGS PRODUCED. 



It was found that the early emerging moths lived long 

 lives, while those which emerged late lived a shorter 

 time.^ We also know that the number of eggs produced 

 by each individual varied from 203 to 486, The question 

 of interest is to find whether large production of ova is 

 correlated with late or early emerging, which is synonym- 

 ous with short or long life. One might suppose that the 

 late emerging insect would produce many eggs from the 

 fact that it had a longer time for forming them. At 

 the same time one might equally well suppose that the 

 early emerging female would deposit many ova from 

 the very fact that it lived longer. We might think from 

 the standpoint of natural selection that those which live 

 long enough to deposit many eggs would predominate 

 and perpetuate a long-lived race. 



After careful calculation, however^ absolutely no rela- 

 tion between the number of eggs and earlj^ or late hatch- 

 ing, or long or short life, was found. 



5. NUMBER OF DAYS SPENT IN OVIPOSITING. 



In 57 mated females I found the number of days spent 

 in ovipositing to vary from 3 to 15. In the 20 unmated 



• The results of the observations on the duration of life are in course 

 of preparation. 



