Perigonia ilus is a moth of the family Sphingidae. It is known from Mexico, Honduras, Costa Rica, Belize, Guatemala, El Salvador, Nicaragua, Panama, Colombia, Venezuela, Ecuador, Peru, Bolivia, Argentina, Paraguay, Brazil and Uruguay. The wingspan is 54–58 mm. It is similar to Perigonia lusca lusca, but can be distinguished by the yellow tornal area of the hindwing underside. Adults are on wing year round.