M ETZ 



PLAT E 1 



'"^BW&^t i^f^^^y 



-^^^^^^^^ 



5 



E. M. Wallace Pinx. 



SEX-LINKED MUTANT CHARACTERS IN DROSOPHILA VIRILIS 

 1. WILD-TYPE o- 2. YELLOW CROSSVEINLESS 3. FORKED" 



IVI T- A 



