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I believe this is Monoceromyia javana...after careful scrutiny of the overall body & antennal proportions, as well as the detailed positions and shapes of the yellow markings visible on the thoracic pleura, abdomen, head, legs...and barely (perhaps?) on the scutellum. Compare with the M. javana images on iNaturalist. For many more details (and links to keys, original descriptions, etc.) see my comments under this iNat post.

There is also a curated lateral image of M. javana here from the BOLD website.