These bright green full-grown caterpillars are 55 to 70 mm in length. There is a yellowish-white sub-spiracle line on abdominal segments one through seven and posterior yellow lines extending across the dorsum of segments one through seven to just above the level of the spiracles.
A mid-segmental transverse band of setae-bearing scoli occurs on all thoracic segments and abdominal segments one through eight. The body is sparsely covered with short, white, spatulate setae. The head varies from green to brown. Just prior to pupation, caterpillars turn a reddish color.
Early instars differ considerably in appearance from the later instars. Some fifth instars are considerably more setiferous (hairy) than others even among siblings. View the gorgeous luna moth here!