66 



A. FRANKLIN SHULL 



Of the 40 females laying these eggs, 12 were kept isolated and 

 the hatching of their eggs recorded separately. The least viable 

 of these twelve families of eggs was one that hatched only 1 out 

 of 21 (viability 4.7 per cent). From the one that hatched, a 

 parthenogenetic line was reared (table 16) to produce a further 

 generation of eggs. This line included 39.3 per cent of male- 

 producers. 



L2. Females of the parthenogenetic line Li were paired with 

 males of the same line February 14 to 24, 1912. From 60 mat- 

 ings thus made were obtained 770 eggs. By March 17, when 

 observations ceased, 272 eggs, or 35.3 per cent, had hatched 

 (table 17). 



From the 60 females that laid these eggs, one was selected 

 that laid 18 eggs, of which but one hatched (viability 5.5 per 

 cent). From this one was bred a parthenogenetic line (table 



TABLE 15 

 Showing number of eggs that hatched, out of 515 in lot Li, figure 1 



Percentage of viable eggs , 28.9 



TABLE 16 

 Showing details of parthenogenetic line Li, figure 1 



Percentage of cf 9 39.3 



