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Looks spot-on to me Tony, many thanks.

Mind you, I had never realised how diverse the Ulidiidae were. One thing that struck me was the degree to which they differed in the types of visual display they presented and yet how many of them had some form of visual display.
And then I was stunned when I encountered Plagiocephalus latifrons.
Do you happen to know of a reference to the stalk-eyed flies in general? This is the fifth family I have run across in which such adaptations occur.