92 ILLIXOIS BIOLOGICAL MONOGRAPHS [486 



PLATE XI 



Figures 135-146. Showing the ontogeny of pigmentation in C. punctulata 

 Oliv., C. sexguttata Fabr., Tetracha Carolina Linn., C. hirticollis Say, and C. is 

 guttata Dej. 



Explanation of Plate 



Fig. 13s, C. punctulata Oliv. at the end of 6 hours after emergence ; 136, 

 after 12 to 13 hours; 137, after 36 hours; 138, sexguttata Fabr. after 24 hours; 

 139, Tetracha Carolina Linn, at the end of 9 hours after emergence ; 140, the 

 adult elytron; 141-145, showing stages in the development of pigment in hirticol- 

 lis Say; 141, 4 hours after emergence; 142, after 6 to 10 hours; 144, after 12 

 hours; 145, after 16 to 24 hours; 146, I2 guttata, after 12 to 18 hours. 



