56 



THEORY OF EVOLUTION 



(i]iiiniD( 

 dnrmrD 



H 



Vt5TicwL Gray ^ — 



p, m 



1m ^onc Ebony 



Long Gray 



1^ "f^ 'T.S 



w 





^ 



KiG. 2+. Cr<iss l)etween long- el)ony unci gray vestigial flies. 



spring are gray witli long wings. It' tliese are 

 inbred they give 9 gray long, 3 gray vestigial, 

 3 ebony long, 1 ebony vestigial (figs. 24 and 

 25). 



