I'm thinking they look more like the Buprestid beetles in the second link I gave above - I just went through a general insect book and there was nothing closer. I'll go through the beetle book now. If you have them in a jar and don't mind doing it, put them in the fridge (or freezer) for a while. (They're less likely "wake up" from the latter unless you want to keep them alive). That way you immobilize them and can get a close-up if your camera is capable.
