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This does look like a species of Ephydra - which is puzzling, as this genus is not found in Peru! Your best course of action is to download the paper by Mathis and Marinoni (see https://biotaxa.o...xa.4116.1.).
This contains a key to all the Neotropical Ephydrini, so you should be able to get this to genus, if not species. At least it is a male, so we can check whether it has been described elsewhere.