318 THE WINGS OF TRICHOPTERA 



If the Micropterygidas be retained in the order Lepidoptera they must 

 be considered the most generahzed members of the order, being near the 

 stem form from which the Trichoptera and the Lepidoptera have been 

 evolved. This view necessitates the explanation of the manner in which the 

 Hepialidas, with their peculiar jugum, and the Frenatse were evolved from a 

 form ha\nng a well developed fibula, like that of Mnemonica and Rhya- 

 cophila. This must be done if the Lepidoptera, including the Micro- 

 pterygidcC, is to be shown to be a monophylitic group. 



