132 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[526 



Showing Color Development and General Modification in Experiments on 

 C. purpurea subsp. limbalis. 



Explanation of Plate 



Figs. 571-574. Color development in C. purpurea subsp. limbalis. 

 571. Condition at emergence. 



Condition 12 hours after emergence. 



Condition 34 hours after emergence. 



Condition 15 days after emergence. 



Normal collected individual. 



Specimen killed and dried when at stage shown in figure 573. 



Experimentally modified individual, in hot dry conditions during pre- 

 pupal and pupal stages. Resembles specimens from eastern Kan- 

 sas. 



Specimen with color modified by being kept in an ice box during the 

 pupal stage (Experiment 65b); mean temperature, 12 C. ; moist. 



Specimen modified by hot moist conditions during the prepupal and 

 pupal stage (Experiment 61); mean temperature, 37 C. ; moist. 



572 

 573 

 574 

 575 

 576 

 577 



578. 



579- 



