Stoneflies are hatching! Check out the video to see two of the numerous adult Stoneflies found hatching on Pine Creek, Tioga County, PA! Stoneflies are aquatic insects found in most PA waters. They spend most of their life under water as a nymph. When ready to hatch, they crawl to stream/riverside rocks or vegetation and hatch on dry land into adults. Their Order name is Plecoptera, meaning “braided wing”. The wings of adults have numerous veins, making them appear braided. Stoneflies prefer fas