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There is not too much info on Xylomyiidae, but what I found out so far looks much better:

http://cedarcreek...002ap.html
http://www.museum...ologie.htm

The list of species in Japan:

http://furumusi.a...5%ad%b2%ca

Solva spp. look quite different, but Xylomya spp look rather similar. I think we are getting closert to this.