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

By: Molly Rains

Outlets: NH Bulletin

Published: August 3, 2026

Words: 864

Last Updated: 8 hours, 25 minutes ago

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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 …

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