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Of course, members of the tribe Cerioidini of Syrphidae are often confused with Conopidae. But, with the terminal aristae, this is definitely subfamily Conopinae of Conopidae...from the wing venation; the long, narrow, forward-pointing mouthparts (barely visible sticking out in front of the head); and subtleties in the shape of the frons/face and vertex.

Unfortunately, currently available online resources for identifying Conopinae in the Hong Kong area seem quite limited...and I can't get further than subfamily here right now.

PS: If this were a cerioidine syrphid (which it isn't ;-), the relatively short length of what (falsely) looks like the "antennifer", when compared to the much long subsequent segment (which would be interpreted as the scape...though it's actually the pedicel in this conopid) would place this in either Polybimyia or Sphiximorpha rather than Monoceromyia.