I know this is a terrible image, but what intrigues me is that this bug was right next to a pair of bigger green beetles (C. mutabilis, I think), and yet it looks like C. impia, of which there appear to be no live images in the Guide. I thought at first it was a different age or sex of the green ones, but when I saw C. impia in the Guide later, I wished I'd tried harder to photograph it! Please frass if not useful or identifiable. Thanks in advance.