248 The Inheritance of Wing Colour in Lepidoptera 



W'l 



1111111111 



iViiumiz 



80 



ibc 



No, of insects 



Colour-va 

 of lutea 



[4 



parent 

 •3 : 4-9 



Colour-v£ 

 of hybr 

 parent 



[0-7 : 0-5 



Fig. 18. (Cf. Fig. 5.) Curve showing the distribution of the orange and yellow colour- values of family '17 C 



hybrid (lutea x gross.) x lutea. 



Two separate curves are added showing the black values of the fore wings, and the orange values of the hind wings. 



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



by the accompanying numbers. 



nigricostata-h ^ ^^36, 37, 38, 45, 49, 51, 52, 53 (radiated), 58, 

 61 (radiated), 62, 70 

 „ ?? 3, 14, 30, 63 (radiated), 74 (mVrociwcta /) 



///^c?50, 69 

 nigrocincta // 2 35 (slightly radiated) 



