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One more question here, and that is about length. I see some on-line sources say Psychoda alternata is about 2 mm in length.

Not sure what the standard way to measure flies is? If I go from the front of the head to the rear of the abdomen on my fly, I get 3.3 mm. If I go from the front of the head to the rear of the left wing (this is somewhat diagonal) I get 4.6 mm. Of couse all this includes the "fur"!