254 The Inheritance of Wing Colour in Lepidoptera 



Colour-vali 



of hybric 



parents 



[10 : 0-6 



[0-9 : 0-4; 



100 

 No. of insects 



Fig. 24. (Cf. Fig. 12.) Curve showing the distribution of the orange and yellow colour- values of family 

 '16 G, hybrid (iwfea x gross.) x hybrid (lutea x gross.). 



The following variations occur in certain insects, whose position along the base line of the curve is 



indicated by the accompanying numbers. 



nigricostata -f-^ ^ IS, 15, 4:5, Gl violacea^2'i semiviolacea ) 



„ „ (right wing only) ,^62 semiviolacea $ $ 7, 8 (fore wings only) nigricostata + S 



„ (left wing only) (^47 



$27 



