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

Key to Adult Males of Eastern Nearctic Blephariceridae: Couplet 8(7)

Inner margin of cercus expanded evenly and broadly, apical margin slightly convex, making outer margin somewhat lobulate; median aedeagal filament of approximately same length as lateral filaments; apex of ventral parameres simple...Bl. capitata Loew	Inner margin of cercus shallowly convex and expanded slightly near base, apical margin straight and contributing to a somewhat obtuse angulate outer margin; median aedeagal filament distinctly longer than lateral filaments; apex of ventral parameres incurved, asymmetrically bifurcate...Bl. similans Johannsen