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Thank you Michael, I can see the difficulties with this one!

Your mention of B. discreta being split from B. striolata brings up another dilemma! I had one last year which was identified as B. striolata, could it also be B. discreta? The eyes seem as far apart, but the fly was smaller and it didn't 'ring a bell'.

http://diptera.in...ost_163490

By asking the question at least the record is here for others searching the site, which is a good thing as I often search the site for clues.