ii6 



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, 

 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 



