As you can see from the ants in the first picture, this insect is peculiarly large - over an inch long. I thought it was dead in the first picture, but it started moving around the next day. A couple of days later I found it again, dead. I have two dead specimens and other pictures if desired.
I think I've seen a shedded exoskeleton of one on a forest trail and another dead one from months earlier.
What species is it?
Location: Oregon, USA.