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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.

Adults are nocturnal and come to light, but can also be found during the day on the host plants. Larval hosts include both dogbane (Apocynum) and less commonly milkweeds (Asclepias). Larvae feed at night, in small groups of 5-7 larvae in the early instars (Cohen and Brower, 1983). The pupa is covered in a cocoon of the same hair. Adults have been collected in mid June in Alberta.