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These Scarlet-bodied Wasp Moths appear to be gathering toxic compounds which are used during mating. The male moths pass on the toxic compounds to the female and her eggs; this is the only insect known to pass on a chemical defense in this way.

They are usually known for doing this behavior with Dogfennel (Eupatorium capillofolium) but it appears they are able to extract the compounds from this dead/dying Boneset, also a species of Eupatorium.

There were at least 16 and at times probably 20 moths on this plant. Well over 20 total in the surrounded patch of vegetation.

An even more exaggerated instance of behavior originally seen here: https://www.inaturalist.org/observations/136059847