title: Nyceryx riscus
text: # 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.
  
  