Isognathus excelsior

Isognathus excelsior is a moth of the family Sphingidae.

Distribution
It is known from Colombia, Venezuela and Ecuador to north-western Brazil.

Description
It can be distinguished from all other Isognathus species by the pure white underside to the abdomen with conspicuous paired black spots on each segment.

Biology
There are probably multiple generations per year.

The larvae probably feed on Apocynaceae species.