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Hello!

Now I know, where those little (black) flies, which Paul identified as possibly Drosophila obscura here: http://www.dipter...ad_id=4720 do come from :-). There are many of them on a partially rotten banana which I placed in the garden some days ago. They have replaced the D. immigrans from autumn there. Are they really the same flies? Length about 2 mm. Thanks!