INHERITANCE IN HYDATINA 



67 



18) to be used for further selection for least viable eggs. This 

 line included 40.7 per cent of male-producers. 



Lz. Females of the parthenogenetic line Lo were paired with 

 males of the same line April 3 to 8, 1912. From 42 such mat- 

 ings, 487 eggs were obtained. To and including April 30, there 

 had hatched 191 eggs, or 39.2 per cent (table 19). 



From the 191 eggs that hatched, one was selected at random, 

 without reference to the viability of the family to which it be- 

 longed. From this egg a parthenogenetic line was reared (table 

 20) which included 36.1 per cent of male-producers. 



TABLE 17 

 Showing number of eggs that hatched, out of 770 in lot Lo, figure 1 



Percentage of viable eggs. 



35.3 



TABLE 18 

 Showing details of parthenogenetic line in L2, figure 1 



Percentage of cf 9 



40.7 



