PLATE 1 



EXPLANATION OF FIGURES 



Photographs of camera-lucida drawings. X 38. 



1 Short vestigial wing. 



2, 3, 5, 6, 8, 9 From selected series A. 



4, 7, 10, 12 From 'crossed-in-and-selected' series C. 



13 From the 'crossed-in-and-selected' series subjected to high temperature. 



14 Normal long wings. 



178 



I 



