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Thank you, Paul!
The upper gnat really looks like Sphaeromias female. However, I have some doubts about the lower one (despite the position of their abdomens)... Do males of Sphaeromias lack that magnificent plumose antennas that I can see on very few images of other Ceratopogonidae males? Is Sphaeromias a biting (blood-sucking) gnat or predaceous?