The story is inspired by the show "Supernatural", although technically these critters are not the baddies of the plot, so I need a "monster of the week" for several "episodes".
The plot begins in New Orleans and will later involve going into West Virginia, so the Adena mounds and the Mothman* will figure later on.
*Although the setting of this series of stories is the early '50s, before the first sightings of the Mothman, it's too perfectly localized to resist.
Searched: the Wikipedia category "American folkore legendary creatures"
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