A medium size (approx. 3.2 cm wingspan) moth. Forwewings powdery; poorly defined antemedian and postmedian lines, median band more prominent. Terminal area suffused with dark scales. Hindwings orange-buff with a grey median line, grey scaling in the basal area and a wide black terminal band followed by white fringe. Antennae simple; sexes alike. Most similar to O. regina, which is smaller, has paler and less banded forewings and brighter yellow hingwings lacking the grey scaling in the basal half.