Marsh flies swarm your beach day? File a greenhead report.

MAINE MORNING STAR • August 6, 2026

A unique kind of beast emerges from the marshlands of the East Coast each July. New England beachgoers know them well: With bulging, Kelly green eyes, and mouthparts that slice into their targets’ skin like scissors, greenhead horseflies can’t be ignored. But with enough data, they can, perhaps, be avoided — at least, that’s what web developer turned volunteer insect data collector Greggory Hogan hopes. On Hogan’s website, The Greenhead Report, users track and compile data on the insect that disrupts beach days and the East’s coastal economy every July and August. At first, Hogan hoped the site — one of many “side projects” — would inform his own beachgoing habits.