Couplets: 1  2  3  4  5  6  7  8  9  

Key to Adults of Holarctic Blephariceridae: Couplet 2(1)

Respiratory lamellae short; outer lamellae several times wider than long, widely divergent; inner lamellae narrow, strap-like, flexible...Apistomyia Bigot	Respiratory lamellae at least twice as long as wide, usually closely appressed, rigid...3