84 SEX INHERITANCE 
wild type A. grossulariata is crossed to the rare mu- 
tant type A. lacticolor. 
GROSSULARIATA 
Fig. 30.—Abraxas lacticolor female by A. grossulariata male. The sex 
chromosomes are represented by the circles in the center of the diagram, 
and the letters contained in them stand for the factors that each carries. 
The W chromosome, confined to the female line, is represented without 
either L or 1; for it, like the Y chromosome in Drosophila, carries no sex 
linked factors. 
