Simon, would you mind uploading one of your photos, it need not be the most artistic or spectacular, but showing (as both of these two do to some extent) the difference between the movement of the tegmina and the hind wings? I am editing the Wikipedia article on tegmen, and functional photos are not easily come by (pinned specimens are plentiful, accompanied by deeply suspect comments!) If you are not in WM or WP, and don't intend joining, I could capture a picture, reduce the resolution to a level to suit you and upload it, crediting you. You can email me at jonrichfield@gmail.com Thanks, Jon