VARIATION AND MUTATION 



135 



in a series of 98 male individuals collected at Indianaijoli.s, In- 

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

 of the right tibitc, S3 had two spines, 2 had three spines, and one 

 had four spines. In the outer row of the left til)iie 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 



0° ^^^} 



Fig. 77. — Diagram showing variation in pattern of the prothorax of a flower bug 



(After Kellogg and Bell.) 



individuals there were in the riglit tibia\ 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 tibi?e, five spines in 2 individuals, four 

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



In the paper from wliich we have taken these illustrations 

 of the actuality of variation, studied and statistically tabulated, 

 are given the data showing the actual extent and frecpiency of 

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

 thorax, and abdomen, character of antennal segments, ninnber 

 of tibial spines, character of elytral striation, character of vcu;,- 



