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It has most of the looks of S. curvipes. The wing venation seems to be slightly different from the specimens I have at hand (slightly more curvature in M1+2 and R4_5 perhaps a little more curved forward). Thye main reason for a slight hesitation is the fact that I cannot see individual curved spines under the hind metatarsi. Perhaps the have become cluttered with debris, making them look like a solid flange.. If you can confirm they are separate curved setae, then ID is confirmed.