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The only "Stenopogoninae" that would be similar IMO is Grajahua (which was collected in Rio de Janeiro). However, its proboscis strongly curves downward and doesn't fit with this fly.

I think it's fair to say it belongs to Dasypogoninae (one can almost make out what appears to be a fore-tibial spine on the right tibia). Cell m3 being open helps narrow it down a bit. I'd say it is most similar to Tocantinia or Amorimius, but not a great match for either. A hard one to ID. Probably an undescribed species, and maybe genus for that matter.