Neococytius cluentius (Cluentius sphinx) is a moth of the family Sphingidae. It is found in northern South America, Central America, Mexico and the Caribbean. It is rare on Cuba. It has been recorded from North America, from Mississippi north to Michigan and Illinois. The wingspan is 140–160 mm. There are at least three generations in the tropics, with adults on wing from December to January, May to June (or July in Jamaica) and October. The larvae have been recorded on Annonaceae and Piperaceae species as well as Ipomoea batatas.