Couplets: 1  2  3  4  5  6  7  8  9  

Key to Adults of Holarctic Blephariceridae: Couplet 3(2)

Bases of outer respiratory lamellae contiguous laterally; inner lamellae much narrower than outer lamellae; all lamellae narrowly tapered apically; branchial sclerite and scutum markedly papillose; labellar sheath elongate...Horaia Tonnoir	Bases of outer respiratory lamellae separated laterally; all lamellae of subequal width and bluntly rounded apically; branchial sclerite and scutum mostly glabrous; labellar sheath short...Hapalothrix Loew