110 ILLINOIS BIOLOGICAL MONOGRAPHS [504 



PLATE XX 



Figures 456-465. Showing the color patterns of specimens of C. tranquc- 

 barica Herbst., C. purpurea limbalis Klg., and C. scutellaris lecontei Hald. sub- 

 jected to high temperature under moist and dry conditions and placed in an ice 

 box during their prepupal and pupal life. With them are shown controls which 

 were kept at normal temperatures or lower and designated with letters a, b' , etc., 

 and a few collected from the normal habitat from the same generation, desig- 

 nated w'. 



Explanation of Plate 



Fig. 4s6a-g, the elytra of seven specimens of C. tranquebarica which passed 

 the late larval, prepupal, and pupal stages in a warm moist chamber ; mean tem- 

 perature of the soil, 37° C. ; maximum for the warmest week, 40 C. ; control, 

 4560', b' , vt/, at 21 (Experiment 56); 457a-b, the elytra of two specimens of 

 C. tranquebarica, which passed the late larval, prepupal, and pupal stages in a 

 warm dry chamber, mean temperature 40° C. ; control, 457a -e'-w' at 21 ° C. 

 (Experiment 57); 458, the same as 457 but dry instead of moist; 458a'-&' control 

 of the same (Experiment 58) ; 461, the same moist warm treatment as described 

 under 456 applied to C. purpurea limbalis: 462, the same as 461 but dry in- 

 stead of moist; for normal patterns see figure 512, plate XXVIII; a collected 

 specimen from the same generation showing the extreme type of cross band re- 

 duction and forward curvature found either in the controls or the collections 

 from the habitata ; 459, showing the pattern of a specimen of C. tranquebarica 

 which was forced through its transformations in the fall by a temperature of 

 37° C. beginning October 1, so that there was no hibernation. This specimen 

 was one emerged early in December. The others emerged in June but none of 

 them showed any modification ; 4600-/7, the same treatment as 456 but dry instead 

 of moist (Experiment 60) ; 463, showing the patterns of specimens of C. scutel- 

 laris lecontei Hald. subjected to conditions similar to those mentioned for figure 

 456; 463d shows markings reduced below anything ever collected near Chicago 

 or produced in the controls (Experiment 63) ; 464a, b, c, showing the patterns 

 of elytra of C. scutellaris lecontei subjected to mean temperature of 39° C. under 

 very moist conditions (Experiment 64) ; 465a, b, c, showing the elytral patterns 

 of two specimens of C. scutellaris lecontei Hald. kept in an ice box during the 

 pupal and prepupal stages ; 10 to 12 C. from July 29 to September 3 ; 16 to 20 

 September 3 to October 16; 466 shows the elytron of a specimen kept at a mean 

 temperature of 40° C, moist; 466a', b', c are the control of- the same kept at 

 21 C. ; 467W/', x' , y' , z show elytra of specimens collected in the habitat from 

 which the experimental material came, selected to show the range of variation; 

 468a and zv . . a shows the middle band of a specimen of C. hirticollis showing 

 the rounded angle, transverse portion perpendicular to the inner border of the 

 elytron and the hooked portion at the end rounded — compare with the normal 

 shown in 468W'. 



