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I see what you mean about the sheen of green. That's neat. Your photos capture that well. Reminds me of that colour changing dress a few years ago. Your descriptions are very good. Sorry, can't help with the name though :)
A species of Stag Beetle I think (Family Lucanidae). Determining the exact species may be difficult. There seems to be a lot of them.
http://bugguide.net/node/view/3103 if you scroll down the page, this photo looks a lot like Platyceroides.
Also, maybe this guy can help
https://twitter.com/BrytheFlyGuy/status/...
Good luck!
Nice photo of this bug!! Spiny little legs he has.
Very nice photos of this beetle. You can really see the green of the thorax in comparison to the yellow shell.