Couplets: 1  2  3  4  5  6  7  8  9  10  11  12  13  14  

Key to Adult Males of Eastern Nearctic Blephariceridae: Couplet 3(2)

Inner margin of cercus greatly expanded near base, reaching to or beyond midline; apical margin with prominent, rounded lobe near outer margin; southern Appalachians...Bl. williamsae Alexander	Inner margin of cercus convex or expanded broadly near apex, apical margin with prominent, triangular or pointed lobe near outer margin; mostly central or northern Appalachians...4