Bugs on Trees

Question

I have swarms of an unidentified bug hanging on the underside of my tree branches. The bug, or at least the carcus, looks like a tiny golden brown armadillo. Can you tell me what this could possibly be? Illinois area.

Answer 1

It might be bagworms:
https://www.gardeningknowhow.com/plant-problems/pests/insects/treatment-bagworms.htm

Or possibly cicadas:
http://web.extension.illinois.edu/cicadas/13or17year.html

Your area is not due for them until next year, but pockets of "early birds" can exist.