Nyceryx riscus
# Nyceryx riscus

Nyceryx riscus is a moth of the family Sphingidae.

## Distribution

It is found from Belize and Mexico to Costa Rica and further south to Bolivia and Argentina.

## Description

The wingspan is 50–58 mm. It is similar to Nyceryx stuarti but smaller and paler. There is an indistinct, grey-centred discal spot and a conspicuous black dot distal of it towards the costa on the forewing upperside.

* Male dorsal (coll.MHNT)
* Male ventral (coll.MHNT)
* Female dorsal (coll.MHNT)
* Female ventral (coll.MHNT)

## Biology

Adults are probably on wing year round.

The larvae feed on mature leaves of Xylophragma seemannianum. They have a solid green tail horn with well-developed bumps. The body is a yellowish or pale green with pale yellow lateral diagonal slashes. The head is pale green with a trace of blue wash.

