128 ILLINOIS BIOLOGICAL MONOGRAPHS [522 



PLATE XXIX 



Showing Development and General Modification of Colors in Experiments in 



C. scutellaris lecontei Hald. 



Explanation of Plate 



Figs. 538-542. Development of color in the ventral side. 



538. 4 hours after emergence. 



539. 10 hours after emergence. 



540. 11 hours after emergence. 



541. 15 hours after emergence — adult coloration. 



542. Adult coloration in a dark individual. 



Figs. 543-549. Color development and color changes in an individual of C lecontei. 



543. 1 hour after emergence. 



544. 11 hours after emergence. 



545. 13 hours after emergence; compare with 553. 



546. 15 hours after emergence. 



547. 3 to 15 days after emergence; drawn at end of third day. 



548. 42 days after emergence. 



549. 85 days after emergence. 



550. C. lecontei, color of modal class, Miller, Ind., April, 1906. 



551. C. lecontei, Miller, Ind., June, 1906. 



552. C. lecontei, color of modal class, Miller, Ind., April, 1905. 



553. C. scutellaris rugifrons, typical specimen, Raleigh, N. C. 



554. C. scutellaris, typical specimen, Topeka, Kansas (not modal class). 

 555- C. lecontei, larvae subjected to hot dry conditions during prepupal 



and pupal stages, note reduced markings and color — compare with 

 normal ontogeny series above (Experiment 63) ; mean tempera- 

 ture 37°; dry; compare with 554 and 553. 



556. C. lecontei, larvae forced by high temperature and brought through 



without hibernation (Experiment 590; mean temperature 37° C. ; 

 moist. 



557. C. lecontei modified by cold conditions during the pupal stage; (Experi- 



ment 65) ; mean temperature, 12 C. ; moist. Note dull color and 

 peculiarities of markings. 



558. Peculiar individual from Starved Rock (Utica), 111., showing the ten- 



dency for all the highly colored species to produce purple forms 

 occasionally. This type occurs at Utica on the coarse sands. 



