Blackish blue / purple beetle-backed fly (Celyphidae, Paracelyphus cf. hyacinthus)
The scutellum is very convex covering the entire abdomen, dark blue with slight purple tint, almost black on naked eye. This beetle-backed fly is relatively larger than other celyphids, with a body length of about 8 mm.
Dr. Stephen Gaimari identified this as Paracelyphus, likely Paracelyphus hyacinthus.