VARIATION AND MUTATION 



135 



in a series of 98 male individuals collected at Indianapolis, In- 

 diana, at one time, 12 individuals had one spine in the outer row 

 of the right tibiae, 83 had two spines, 2 had three spines, and one 

 had four spines. In the outer row of the left tibiae of the same 

 individuals, there were three spines in 6 individuals, two in 75, 

 and one in 17. In the inner rows of tibial spines in these same 



FIG. 77. Diagram showing variation in pattern of the prothorax of a flower bug t 

 (After Kellogg and Bell.) 



individuals there were in the right tibiae, five spines in 5, four 

 spines in 40, three spines in 43, two spines in 9, and one spine in 

 1 individual: in the left tibiae, five spines in 2 individuals, four 

 spines in 48, three spines in 39, and two spines in 8. 



In the paper from which we have taken these illustrations 

 of the actuality of variation, studied and statistically tabulated, 

 are given the data showing the actual extent and frequency of 

 variations in various characters, such as color patterns of head, 

 thorax, and abdomen, character of antennal segments, number 

 of tibial spines, character of elytral striation, character of vena- 



