Ahhhh its a freakin helgramite. They are some weird worms that get giant thorns and wings during certain seasons. These things are super aggressive too. They actually fly towards you to bite you. I hate these things, there usually along rivers. Ive heard they are GREAT for fishing.
Sidenote* It WILL draw blood if it bites you. Be careful. These things are literally MONSTERS of the insect world.