u6 



VARIATION IN LEPTINOTARSA. 



This scheme has exactly the same chance of being true or false, and for the 

 same reasons, as has the one constructed for the lineata group. In a like 

 manner and upon similar data we may build up schemes of phylogenetic de- 



velopment for the other groups of Leptinotarsa, or for the entire genus. In 

 text-figure 6 is represented such a scheme. 



In text-figure 6 the phylogeny of the genus Leptinotarsa, as revealed by the 

 study of its variation and distribution, shows uniformly a species formation 



