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Tony and Paul, thanks so much for your help with these. Let me just add for the record, that I am quite certain the first and second photos on this page show the same pair of flies. I took quite a few consecutive photos of them over the course of several minutes, and these two photos are from that series.

By the way, nearctica.com lists only one species in Rondaniella for America north of Mexico, namely R. sororcula Loew 1869 (Leia). Is my pair likely this species, or is there a nomenclature issue in this genus?