88 



John Henry Corns tock 



of the frenulum-bearing moths, and do not agree with the 

 Jugatae in their distinctive characters (z. e., in an equal reduc- 

 tion of the two pairs of wings, and in having radius of the 

 hind wings branched). 



If the wings of one of these moths or of a butterfly be ex- 

 amined it will be seen that there is a large expansion of the 



vm 

 Fig. 32. — Sericaria. 



humeral angle of the hind wings (Fig. 30, 14), which causes 

 the two wings of each side to overlap to a much greater ex- 

 tent than they do in other Lepidoptera. 



This extensive overlapping of the wings effectually insures 

 their synchronous action without the aid of a frenulum, and 

 I believe explains the loss of the frenulum. This theory is 



