The female moths lay pellucid green eggs.

There are at least two generations per year with peak flights from January to February and again from June to July.

In its larval form, the Hemeroplanes triptolemus is capable of expanding its anterior body segments to give it the appearance of a snake, complete with eye patches.

This snake mimicry extends even to the point where it will harmlessly strike at potential predators.

[2][citation needed] The moth is known from Costa Rica, Belize, Mexico, Guatemala and probably flies throughout Central America into Colombia, Ecuador, Bolivia, Argentina, Venezuela and Guyana.