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Thanks John. I see Drosophilidae is a large family, including fruit flies. I wonder if there is an online reference I can use to identify down to family or even species? The theory about the mite seems plausible. The live specimen under the stereo microscope does appear similar to mites I have observed on bees.

Is the white projection near the root of the wing what I see referred to as an "anal cell"? See new close up image attached.