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Hi Piet,
I agree...

In females, the color of the third antennal segment is not always clear to me. Especially in the top picture, the third segment appears truly dark. In the second indeed they are only slightly infuscated.

To illustrate my point:
This picture (a male this time) http://www.diptera.info/photogallery.php?photo_id=4762
is badly identified - right?? I think this should be S. dryomyzina and not S. testacea.
- The tibia 1 and tarses are clearly black, indicating S. dryomyzina (feature, apparently only to be used in males)
- And the antennae are slightly blackish (indicating S. testacea).

So the 'orange' third segment can in fact be more dark as well for S. dryomyzina.
I mean, antennae for S. testacea should be clearly black black (eg this picture: http://www.dipter...to_id=4702)

Anyhow, I was a bit too fast since I was led too much by the first picture of black antennae - while they are in fact only slightly blackish :-)

Bye Jonas