Type species: Ambulyx eurycles Herrich-Schäffer, , by monotypy.
A junior homonym of Ambulyx Westwood, 1847 (Lepidoptera: Sphingidae). There is no new replacement name, but Ambulyx eurycles is congeneric with Sphinx strigilis, 1771, the type species of Protambulyx Rothschild & Jordan. The latter is thus available for use as a subjective replacement name. Ambulyx was regarded by Herrich-Schäffer as a Boisduval manuscript name.