Black flies: Maine’s smallest trail bullies

MAINE SUNDAY TELEGRAM • June 14, 2026

Black fly season in western Maine does not arrive quietly. It announces itself in your ears, around your eyes, behind your neck and anywhere else it can find exposed skin. Black flies and other biting insects are drawn by carbon dioxide, body heat, sweat, scent, movement and dark clothing. The bites are different from mosquito bites. Mosquitoes pierce the skin. Black flies cut or slice it and feed from the blood, which can help explain why the bites may leave angry, swollen welts. How to avoid them: repellent, long sleeves and pants, light-colored clothing and a bug head net. It is best to consult a doctor if swelling persists or there are questions or concerns.