The biggest is Titan Beetle up to 6.5 inches (16.7cm)http://en.wikipedia.org/wiki/Titanus_giganteushttp://www.bbc.co.uk/sn/tvradio/programmes/lifeintheundergrowth/video.shtml Abusive comment hidden. (Show it anyway.)
http://en.wikipedia.org/wiki/Titanus_giganteus
http://www.bbc.co.uk/sn/tvradio/programmes/lifeintheundergrowth/video.shtml