Dark Shadflies
This common name refers to only one species.
These are sometimes called Dark Shadflies.
In
Caddisflies, Gary LaFontaine attributed the famous spring hatch on the Beaverkill (now known as the "Apple Caddis") to this species. After that publication, entomologists described that major hatch as a new species --
Brachycentrus appalachia.
Brachycentrus numerosus is probably still important in many locations.