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It is a long time ago, having posted a photo on Diptera.info, so I hope it will show..

I have made a drawing instead of photos.
On this drawing we can see the position of the setae on the tibia.
In your case we have to look for the av seta on the midtibia and the apical pv seta…...which both should not be present.
In Phorbia moliniaris there are two ad setae present (one strong and one above which is les strong) and one av seta on the midtibia…….and a small short but strong apical pv seta (which is very difficult to see)

If you still have some doubts to interpret those setae…...just try to collect coming spring more specimen and send them to me.

I hope this will help for now….

Johanna