ID pointers: An unmistakable autumn species having two colour forms. The paler brown form has a stunning dusting and streaking of emerald green across the forewing. The oval and kidney marks being paler brown and obvious. There is a broad creamy cross-line at the outer wing edge and a large pale cream tufted area on top of the thorax. The melanic form, which is a darker brown lacks the green suffusion. There is also a crescent mark close to the forewing trailing edge.