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Dear Johanna,
Your explanations are always so comprehensive and clear - big thanks for all your efforts! The learning effect is immense. The theory of leg chaetotaxy (naming the position of bristles) is clear, but the transfer to a tiny, flexed leg of a living fly is still difficult! I should better practise it on a dead fly with a stereo microscope.
As to our Lasiomma, the hind leg is rotated about 45°. Mentally put back into ideal position, the two left setae seen in the left pics may well be av. The femoral setae seem to be rather long, too. So L. seminitidum is really a good choice! Thanks once more - it is great to get such detailed information and not only a name |t.