BXPI^ANATION OF PI.ATE 24. 



This plate illustrates the laws of coloration in the genus Leptinotarsa, 



The figures are semi-diagrammatic representations of the condition found in different 

 species of the genus. The lettering used on this plate is the same as employed in text- 

 figures I, 2, 3, 7, 8, 9, and lo. 



Figs. I to 8, elytra of several species to illustrate the laws of coloration of the elytra.. 



Figs. 9 to 16, pronota of several species to illustrate the laws of coloration. 



Figs. 17 to 22, to illustrate the laws of coloration upon the body segments. 



