Diagnosis. 21mm. This species is much larger than lignea but of a similar build and wing shape. The antennae are elongate, bipectinate, the pectinations tapering away gently distad. The forelegs are more heavily tufted with scales than in lignea, and the labial palps also, these extending further back over the thorax, the third segment and the distal part of the second being in a straight line; there is a dorsal, straw-coloured hair pencil running up over the third segment. The forewings are obscurely mottled and fasciated in grey and brown as illustrated, with rusty orange zones within this basally and beyond the discal mark. The thorax and the discal area of the more uniform brown hindwing are also tinged orange. On the underside, the postmedial and submarginal fasciae are clearer, darker, finely crenulate against paler ground. In the male abdomen the apodemes of the eighth tergite are slender and much longer than in lignea. The genitalia have the uncus much deeper. The valves are shorter, apically rounded rather than tapering, and with a subbasal angle to the costal margin. The aedeagus vesica does not have the coarse spining on a central diverticulum seen in lignea.
