

if Yellow seed 



parent 



Green seed 

 parent 



First hybrid generation 

 Allyellow seed 



Second hybrid generation 

 Three yellow, one green 



I - 



The Colorado Potato Beetle 



Leptitwtarsa decemlineata 



\ 



'~"N i < 



' / \ y 



Variety pallida \ { Parent type >y f Variety tortuosa 



Potato Beetle 

 Leptmotarsa muititceniata 



