Eggs are laid on plants or stones under flowing water. The eggs hatch and develop into larvae, which attach to submerged rocks and pupate. They then pupate in a conical shaped cocoon. The adults then emerge later. | Eggs are laid on plants or stones under flowing water. The eggs hatch and develop into larvae, which attach to submerged rocks and pupate. They then pupate in a conical shaped cocoon. The adults then emerge later. |