THE DEVELOPMENT OF WINGS 



111 



Fig. 112. — The six postembryonic instars in the development of Lopidea robinice. 



In the third instar the wing-pads are just beginning to show; in the fourth, 



they reach back nearly to the third abdominal segment; in the fifth, 



they reach to the middle of the fifth abdominal segment ; in the 



sixth or adult instar the wings extend beyond the tip of the 



abdomen. (After Leonard 'i6). 



