532 



MARY B. STARK 



TABLE 1 



* Two matings showed rathei high sex ratios, and as this is often indica- 

 tive of a lethal factor, I mated individually six of the virgin females from each 

 bottle (twelve in all) to males from the same bottles. Since each bottle of the 

 twelve (table 2) gave a 1 : 1 ratio it follows that the somewhat lower values 

 noted in these two bottles was probably merely a chance deviation, or else due 

 to the crowded condition of the bottle which prevented all of the males from 

 hatching out. The males are known to continue hatching for some days after 

 the females have ceased to hatch. 



