Does anyone know what insect is this?

Living in Brasília, central Brazil; currently experiencing rainy warm/hot days.

This looks like it's a female Pelecinid parasitic wasp (see this page for an overview of the family in the western hemisphere); from your location the species is either Pelecinus polyturator or Pelecinus dichrous (all of BugGuide's images are of the former, that being the one also found in the United States).

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