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Unfortunately I don't have access to specimens since am not currently in Asia, so cannot check on wing venation. Yes, I realize the danger of IDing based on superficial similarity but the flies I have in mind must belong to a single genus even if they don't represent a single species. Whether the genus is Mimegralla remains to be confirmed. The following paper might be relevant; I have not seen it:

McAlpine, D.K. 1998. Review of the Australian stilt flies (Diptera: Micropezidae) with a phylogenetic analysis of the family. Invertebrate Systematics 12(1): 55-134.