Erebidae is today the the largest family with some 25000 species. The molecular evidence has been and is redefining the limits of this family. One of the recent changes has been the inclusion of the family Arctiidae within Erebidae. The group Arctiidae was found to be related to Erebid subfamilies and consequently Arctiidae turned into the subfamily Arctiinae within Erebidae. So all our former arctiids, which were a lot, now increase the family Erebidae.
The adults are varied either in colouration, form or size. The larve show the loss or reduction of the prolegs, which leads to confusion with larvae of noctuids and geometrids. Some caterpillars are smooth, some others are hairy (like the Arctiinae) and some others have urticant barbed setae.

Yellow-browed tyrant Satrapa icterophrys

Yellow-browed tyrant Satrapa icterophrys