The Exposed Bird-Dropping Moth has a wingspan of 1 5/8 to 2 1/4 inches and, like other bird dropping moths, has a coloration and resting posture that resembles a bird dropping. They are sexually dimorphic. The male is mostly white. The forewing of the male has 2 gray-brown costal patches and gray-brown shading beyond the PM line. The female is mostly dark gray with a large white patch on the side of the head and thorax. The forewing of the female is dark gray except for 2 white costal patches. The hindwings of both sexes are white with a faint brownish subterminal line. The caterpillar is green or brown usually with a round black spot around the spiracle on the first abdominal segment. There is a tan zigzag lateral mid-stripe and a rounded hump over the 8th abdominal segment. The caterpillar grows to 1.25 inches.