Upon reaching adulthood, their size is variable. They are usually quite large, with a wingspan of about . The cecropia moth's wings are brownish with red near the base of the forewing. There are crescent-shaped spots of red with whitish centers on all wings, but are larger on the hindwings. All wings have whitish coloration followed by reddish bands of shading beyond the postmedial line that runs longitudinally down the center of all four wings. The body is hairy, with reddish coloring on the anterior, and fading to reddish/whitish. The abdomen has alternating bands of red and white.