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I wish I had seen these flies in the field! I did not notice them until I got home and looked at the pictures.

Is it possible to ID the fly family? I am curious if there is an interesting behavior going on, or were the flies just resting on the bugs?

Gervasio Silva Carvalho was kind to identify the mating bugs: they are Sphenorhina rubra.

Date: 21 June 2014. Place: Brokopondo district, along the Suriname River. Mixed tropical forest and gardens.