Eastern Dobsonfly (Female)

Near clean, fast-moving freshwater streams and rivers. They are often attracted to porch lights at night.

Adults may feed on nectar or not eat at all; larvae (hellgrammites) are predatory, eating aquatic insects and small fish.

Adults are nocturnal and short-lived. Females lay eggs on rocks or leaves overhanging water. Larvae spend several years underwater before pupating on land.

Benefits: Larvae are indicators of good water quality and popular fish bait. Risks: Females (pictured) have strong mandibles and can deliver a painful bite if handled; they are not venomous.