The Yam Hawk Moth (Theretra nessus) is a moth of the Sphingidae family. It is found in Sri Lanka, India (including the Andaman and Nicobar Islands), Nepal, Burma, Thailand, southern China, Taiwan, South Korea, Japan, Malaysia, Indonesia, northern Australia and New Caledonia. It is a recent immigrant in Oahu. Theretra nessus larva (2) and pupa (2a) Theretra nessus sjh.jpg The wingspan is 90–130 mm. Larvae have been recorded on Amaranthus, Barringtonia, Discorea, Amorphophallus, Impatiens, Citrullus, Arathis, Boerhavia, Knoxia, Morinda, Oldenlandia, Pongamia, Spermacoce, Glossostigma and Camellia.