i go Heredity and Eugenics 



All the individuals were allowed to remain in the colony, and 

 interbred freely in August, giving early in September a second 

 generation, of which the following census was made : 



A B C D E 



46 IOI QO I,2Q2 2IO 



These hibernated during the winter of 1905-6, and were not 

 seen again until September, 1906, in the fourth hybrid 

 generation of the culture. At this time the dominant form 

 was manifestly a combination between L. decemlineata, 

 L. oblongata, and L. multitaeniata, with the oblongata- 

 decemlineata attributes in excess of those of L. multitaeniata 

 (a combination between classes D and E of F 1 and F 2 ) : 



A B C D E 



7 25 12 2,2IO 



The huge preponderance of this complex type, which 

 was neither one nor the other of the three species, suggests 

 at once, of course, that the results could not be due to any 

 selective process, because the type was not one of the 

 original types but a hybrid complex. 



The wintering conditions of 1906-7 were especially 

 rigorous, at least as judged by the number of beetles that I 

 found in that location in 1906-7, when the following census 

 was made: 



A B C D E 



004 422 



This shows that during the winter practically only the 

 hybrid combination was able to survive. These repro- 

 duced and gave a progeny in July, 1907. An inspection 

 was made early in August, when I found only the dominant 

 type present in the fifth hybrid generation. 



A B C D E 



ooo 1,877 



The culture was not seen again until the spring of 1908, 

 when a considerable number of the dominant form of the 



