Red Flat Bark Beetle (Cucujus clavipes)

That pretty much describes it, metallic red, flat and preferring to live under the bark of trees.  I photographed this fellow crawling on my stone entrance walkway.  They like to suck the phloem (the vascular tissue that conducts sugar produced in the leaves down to other parts) of trees and eat smaller insects.  They emerge in April and May as adults having overwintered in below freezing temperatures.  They tolerate freezing by first dehydrating to prevent the formation of lethal ice crystals.  In addition they produce antifreeze molecules to prevent the remaining water from killing them.