Couplets: 1  2  3  4  5  6  7  8  9  

Key to Adults of Holarctic Blephariceridae: Couplet 6(5)

Prominent mid-dorsal spine on each of first 5-6 abdominal segments; antennal sheath of "normal" length...Neohapalothrix Kitakami	Spines absent on abdominal segments; antennal sheath short, barely exceeding base of wing sheath; lamellae of respiratory organs usually broad and undulating distally...Bibiocephala Osten Sacken