ID pointers: Named after the markings on the front of the head which look like spectacles. A large thoracic tuft on top of thorax. Forewing is grey tinged with black, pink or lilac and dusted with white in places.. A prominent dark greyish-black cross-band through centre of wing that holds the oval and kidney marks that are edged black. Cross-lines are bordered brown and edged in black. There is a smoky blotch in the corner of each wing tip and a white outer cross-line.