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Hi bonitin,

I didn't know why you thought it was an intersex specimen. The abdomen is somewhat strange, I agree. But it don't look like an intersex specimen to me.

That having said, I'm no expert concerning intersex specimens, and the specimens in the gallery look awfully the same.
There seems to be confusion on the matter if you search for more info, even on diptera.info itself, as the two post below reveal.

Paul Beuk mentions that darker appearance and intersex in one specimen can be related:
http://www.diptera.info/forum/viewthread.php?thread_id=13048&pid=61129.

In yet another post Gerrard Pennards disagrees with a presumed intersex specimen:
http://diptera.info/forum/viewthread.php?thread_id=32361&pid=143572

Both have similar features to your specimen.

Just trying to help,

Greets,

Ectemnius