58 journal of economic entomology [vol. 10 



Prolificacy 



Number of Eggs per Female. In experiments conducted in 1913 

 with females under caged conditions 8 females averaged 522 eggs. 

 They were not dissected to see if they contained any additional eggs. 

 It was thought that females under caged conditions would not deposit 

 as many eggs as they would in the orchard and dissection of moths in 

 1916 showed that caged females, after they had died, contained a 

 number of eggs. 



Records of three moths made in 1916 yielded the following results: 



Although the 1916 data is on only a few individuals it would indicate 

 that the number of eggs deposited by a normal female is higher than 

 the 1913 experiments indicated. In the latter case the females 

 were starved and, what is more, they were not dissected for eggs. 

 An expectancy of 800 eggs per female would not seem to be unreason- 

 able. 



Fertile Eggs 



Eggs from eight different females were tested to determine what 

 per cent, of deposited eggs were fertile. The results appear in the 

 table which follows : 



Period of Incubation 



In the laboratory the period o" incubat on for eggs was usually 

 five days. But in the screened insectary, where eggs got the exposure 

 of the sun for half the day, they hatched usually in about ten days. 

 This was in August. In the orchard where eggs will frequently be 



