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Hello Steve,
Yes, i't proves my point.
I took the liberty to work your picture a bit, you see antennal segments 1, 2 and 3.
In cautum 3 should be as long as 1 and 2 together, which clearly isn't the case. 3 is much shorter than 1 and 2 combined.
So it's a female Chrysotoxum verralli!
Greetings