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The wing venation indeed looks like those of other Rhagionidae species.

http://xespok.net...1000026144

But the jizz of this fly was drasticly different. Also this is a giant species compaeref with others.

But I observed only Chrysospilus and Rhagio spp. so far, at least as far as my identified Rhagionidae are concerned. But there are around 5-6 more smaller genera around in Honshu.