Perigonia ilus is a moth of the family Sphingidae first described by Jean Baptiste Boisduval in 1870.
Distribution It is known from Mexico, Honduras, Costa Rica, Belize, Guatemala, El Salvador, Nicaragua, Panama, Colombia, Venezuela, Ecuador, Peru, Bolivia, Argentina, Paraguay, Brazil and Uruguay.
Description The wingspan is 54–58 mm. It is similar to Perigonia lusca lusca.
Biology Adults are on wing year round.
The larvae have been recorded feeding on Calycophyllum candidissimum, Guettarda macrosperma and Ilex paraguariensis. They are green with a yellow tail horn and a dark blue stripe down the back. There are several colour morphs.
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