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Hi Steve.
I've tried to find the topic about my Bessa selecta, but did not succeed. To long ago I think.
You can find this fly on my website. (The eighth fly.) http://www.tuin-t...engels.htm It was determined by Jaakko
When somebody asked why, was this his commen: Just a combination of features: sharp kink in the m-vein, white hairs behind the head, low "short-legged" sitting position and small size. 
I hope he was right, for the only difference i can find is indeed Terites 3 and 4 with discal bristles for selecta and Tergite 3 without, tergite 4 almost always without discal bristles for parallela.

Regards, Thijs