246 The Inheritance of Wing Colour in Lepidoptera 



5: (0 5-0 



It 



O 3 



O 



Mean colour- 

 values of lutea 

 parents 

 [3-9: 3-7] 



[3-6 : 3-4] 



10 



20 



40 



60 



80 K 



No. of inse 



Fig. 16. (Cf. Fig, 3.) Curve showing the distribution of the orange and yellow colour- values of the offspring 



from 13 pairings of lutea x lutea. 

 These families included no variations. 



