noun
- a mayfly, especially one that emerges in large numbers during late spring or early summer
Usage: regional; North American
Examples
- The shadflies swarmed around the streetlights near the lake.
- Fishermen know that shadfly season brings excellent trout fishing.
- The car windshield was covered with shadflies after driving by the river.
- Local residents expect the annual shadfly emergence in June.
- The shadflies only live for a day or two as adults.
- Birds feast on the abundant shadflies during their brief emergence.