Superhatch
Guides
Ephoron album
Say's Burrowing White Mayfly, White Fly
Ephoron album is a burrowing mayfly native to eastern and central North America, notable for synchronized mass emergences ('superhatches') involving millions of individuals in late summer evenings. Adults have pale milky-white wings and live less than 24 hours without feeding. Nymphs inhabit silty riverbeds and develop for several months to one year before emergence. The species was first described by Thomas Say in 1823 during the Long expedition to the Mississippi headwaters.