LEPIDOPTERA 



711 



the front wings (Fig. 905). An approach to this form of wing is 



represented by some saturnians and by certain geometrids; but the 



former are larger, stout-bodied moths, and both 



differ in wing-venation, cubitus of the fore 



wings appearing only three-branched with 



them, whereas it appears to be four-branched 



with the drepanids. 



In addition to the more typical members 

 of this family, which are known as the hook-tip 

 moths, there occurs in our fauna a single species, 

 Eudeilmia herminidta, in which the fore v ings 

 are not falcate (Fig. 906) . 



In this family veins Sc-f-Ri and vein Rs of the hind wings are 

 closely parallel or coalesced for a space beyond the end of the discal 

 cell, resembling in this respect the Thyatiridse. But the Thyatiridse 



Fig. 905. — Drepana ar- 



cuala. 



r:Rz^§iR 



R.^^ 



2d A 



2d A 



Fig. 906. — Wings of Eudeilinia hermimata. Fig. 907. — Wings ol Drepana arcuata. 



are true frenulum-conservers, while the Drepanidas exhibit a very 

 anomalous condition as regards the preservation or loss of the 

 frenulum. 



While the form of the humeral angle of the hind wings in the 

 DrepanidcB is that characteristic of the frenulum-losers, some of these 

 moths retain the frenulum and in others it is lost (Fig. 907 and 90S). 

 When the frenulum is present it is borne at the end of a long costal 

 sclerite. 



