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Photographed yesterday in Zhejiang China. Around 4mm in body length. Looks similar to Syntormon pallipes identified here by Igor Grichanov at: https://diptera.i...d_id=38142. A congener?

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Lateral shot

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Rhaphium? There is a key in Qilemoge et al. (2019), https://doi.org/1....840.31602 (and see https://biblio.na...ntomologie for many species descriptions).

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Thank you John for the reminder! I suddently remember that Rhaphium has also similarly peculiar antennae. I'll take a look at the links! Thank you! :)

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I'm guessing this one could be the male one of my previous observation at: https://diptera.i..._id=112040

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Rhaphium sp. (Doli). China has several species with long cercus.

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Thank you, Igor, for the kind confirmation and additional info! :)