82 



THEORY OF EVOLUTION 



that differ from each other markedly in color 

 patterns (fig. 43). When any two individuals 

 of these races are crossed they give, as Xabours 

 has sho^^ii. in Fo a ]Mendelian ratio of 1: 2: 1. 

 It is obvious, therefore, that there are here at 

 least nine characters, any two of which be- 

 have as a jNIendelian pair. These races have 



EC 



Fig. 43. Four wild types of Paratettix in uj^per line with 

 tiiree hylirids lieluw. (After Xaboure.) 



