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Hi Jim,
after asking an expert I got a private message: "...This gnat is Leia fascipennis, a common species, which is often found on tree foliage. Most Leia including subfasciata have some dark markings on the abdomen and as was mentioned bilineata also has other marks on the wing. Mycetophila cingulum ... is quite unrelated, only resembling it in coloration but it also has dark markings on the abdomen and a spot in the middle of the wing ...".
Greeting Kuv