EYE COLOR IN DROSOPHILA MELANOGASTER 



373 



c, b, and a are quite similar in color, b and c being especially 

 alike. Cream III is about half-way in color between eosin and 

 white. The grades represent, as near as could be approximated, 

 the mode of each color modification; there is in each case some 

 fluctuation in the direction away from the eosin grade and a 

 greater range in the direction toward eosin. Since the eosiij 



FEMALES 



MALES 



Dark 



Eosm 



Pinkish 



Cream II (het: 

 w-w"" dark 

 Cream c 

 Cream b 

 w-w'' 



Cream a 

 Cream III 



Cream II 



Whitino- 



Dark 

 Eosin 



Cream ll(hetl 

 Pinkish 

 Cream c 

 Cream b 



Cream a 



Cream III 



Cream II 



Whiting 



Diagram 1. 

 grades). 



The scale of modifications of eosin in females and males (modal 



male is of a lighter eye color than the eosin female, it became 

 necessary to arrange two such series of grades in order to repre- 

 sent the total range. After the separate distributions of color 

 for the female and the male had been plotted, lines were drawn 

 connecting the corresponding types in the male and female 

 series. The surprising fact was then observed that all but one of 

 the lines, if continued, would intersect the base line at about the 



