246a (245a).    Fore wing with discal cell set obliquely, the end distinctly closer to the hind margin

           than to costa; vein Cu-2 very short and usually extending directly back to wing margin….....…247

 

 

246b.    Fore wing with discal cell axial and central; vein Cu-2 normally long and continuing

              parallel with median veins (also see couplet 247)............................................

.....................................................……......................(Lepidoptera)  Lavernidae  &  Cosmopterygidae