[2][3] The larvae are black with fine longitudinal yellow lines, which may be indistinct, pale spines and two horns on the head.

The heads of the pupae have a pair of elongated "rabbit ears", green with a white seam, forming a V-shape.

[2] The range of the ringless blue cracker extends from Mexico, through Costa Rica and Panama, to Guyana, Colombia, Peru, Bolivia and southern Brazil,[1] with a single individual being reported as a vagrant in Texas.

They rest in an unusual position with only the prolegs touching the leaf blade, and the head with their horns projecting forward.

They have a habit of perching on the trunks of trees in a head-down position with their wings spread out in close contact with the bark.