What is this?

Jack says it's a "potato bug." I almost stepped on this little fellow last week when we were walking along the bluffs. Since it was still wiggling its feet a bit, Jack flipped it over so I could take a proper portrait. It was huge! Like, two inches long. My god, it looks like a dinosaur, doesn't it.

This handsome dinosaur bug is most assuredly dead by now, and I say it like that because I've been reading Evelyn Waugh.