52 



MASS. EXPERIMENT STATION BULLETIN 189. 



definite data were secured as to the number of females fertilized by each 

 male. Bearing in mind the long period of adult life, however, it is prob- 

 able that each male will fertilize several females. 



Proportion of Sexes. 



First Generation. 



A total of 317 first generation pupae were collected from the field in 



July, 1918, and confined in individual cages. From these a total of 317 



first generation adults emerged, of which 136, or 42.9 per cent, were 



males, and 181, or 57.1 per cent, were females (see Table XIV). 



Table XIV. 



Proportion of Sexes and Time of Emergence of Moths, 

 First Generation. 



Total emergence, 317 adults. 

 Total males, 136, or 42.9 per cent. 

 Total females, 181, or 57.1 per cent. 



A total of 49 first generation pupse were reared from full-grown, first 

 generation larvae collected in the field during July, 1918, in order to secure 

 data as to duration of the pupal period. From this material a total of 49 

 fijst generation adults emerged, of which 19, or 38.8 per cent, were males, 

 and 30, or 61.2 per cent, were females (see Table IV). 



