My kids and I found these bugs in a damp, walking tunnel in Central Wisconsin. They were 3-4 inches long and had big, sharp pinchers that they used violently to defend themselves. They are very prehistoric looking. My guess is that it is some type of larvae. What are these, and are they usually lightning fast and deadly poisonous (LOL)?
If you think the Hellgrammite is frightening, you should see the adult male winged Dobsonfly. Both larvae and adults are harmless. Hellgrammites are a choice bait for fishermen.