Nyceryx magna is a moth of the family Sphingidae.
[2] It can be distinguished from other Nyceryx species by the dark forewing upperside and the brownish-orange basal area and pale purple bands in the tornal angle of the hindwing upperside.
Early instar larvae have very large heads and elongated tails.
The head has a distinctive blue-green colour in the final instar and the tail is shorter and rough.
The pupa is smooth and shiny with alternating light and dark bands on the abdomen.