I'll follow with another question. When I was a kid we used to fish the western part of the state when visiting our grandparents. In the creeks and rivers was a bug that we call "Rock Worms". They were up to an inch long and fat. The front half is like a black bug while the back half was was worm like with 2 graspers to hold them in their shell.
In late July, early August they would seal off their shell (made from small pebbles) and attach themselve to the rocks. When emerging they were rust colored on the back and paler underneath. Great fish bait.
What are they?
We have similar in this side of the divide, but much smaller and more numerouse.
