A medium-size (3-4 cm wingspan) white moth. The costa of the forewing is broadly buff-yellow almost to the apex. The the head and front of the thorax are the same color. The body is mostly yellow-orange, with black spots on the dorsal and lateral surfaces. Male antennae narrowly bipectinate, female simple. Sexes similar. No other Alberta moths are white with a yellow costa. The Larvae are covered in soft dense grey or whitish hair.