Adults are thought to be pipevine swallowtail mimics and can be difficult to separate from dark swallowtails if seen in flight at a distance. Note the lack of tails, the black lines near the hindwing margin above, and the red-orange spots beneath. No swallowtails have ventral red-orange spots near the body.
The larvae mimic bird droppings. They are humped at the thorax and covered with numerous tubercles, with one longer pair on the thorax. Body color is mottled shades of brown, brownish yellow, white and green.