118 ILLINOIS BIOLOGICAL MONOGRAPHS [512 



PLATE XXIV 



Explanation of Plate 



Figure 4700. Showing the distribution of the group of races included under 

 C. scutellaris Say. The legend indicates the color of the elytron. The numbers 

 (italics) refer to the classes of color patterns indicated in figure 470, plate XXIII. 

 The lines and numbers indicate mean annual rainfall in inches. The mean annual 

 rainfall to the left or west of the line designated as 20 is less than 20 inches, to 

 the right or east more than 20 inches. To the east and south of the line desig- 

 nated as 30 the mean annual rainfall is more than 30 inches. To the east and 

 south of the line designated as 40 it is more than 40 inches. Note that the colors 

 are fairly well correlated with rainfall. 



