Acosmeryx castanea is a moth of the family Sphingidae. It was described by Rothschild and Jordan in 1903.
Is known from eastern and southern China, Taiwan, South Korea and Japan.
The wingspan is 75âÂÂ90 mm.
In Hong Kong, adults are on wing from March to late September. In Korea and Japan, adults are on wing from late June to mid-August. There are multiple generations per year.
The larvae feed on Ampelopsis glandulosa and Cayratia japonica.