Ambulyx substrigilis, the dark-based gliding hawkmoth, is a species of moth of the family Sphingidae. It was described by John O. Westwood in 1847.
It is known from Sri Lanka, India, Nepal, Bangladesh, the Andaman Islands, the Nicobar Islands, Thailand, Vietnam, China (Hainan Island), Malaysia (Peninsular, Sarawak), Indonesia (Sumatra, Kalimantan) and the Philippines.
The wingspan is 96âÂÂ120 mm.
The larvae have been recorded feeding on Aglaia littoralis in India.
In The Fauna of British India, Including Ceylon and Burma: Moths Volume I, the species is described as follows: