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In French Guyana I have often seen flocks of those tiny black-and-red nymphs. Looks like the same species.
https://en.wikipedia.org/wiki/Megacyllen...??? Megacyllene seems to be a beetle.Silvery checkerspot = Chlosyne nycteis.
What a majestic animal.
It looks a lot like Minuartia sedoides, which seems confined to european high mountains. Check american species in the Minuartia genus; family Caryophyllaceae.
The titan beetle (Titanus giganteus) is a giant cerambycid from South America. See: https://en.wikipedia.org/wiki/Titan_beet...
Thank you, loarie.
Thank you, Zlatan.
This is not a housefly, but a member of the very large Tachinidae family. Possibly Tachina fera or a close parent.