Boatmen (and Boatwomen apparently) flies, Pogonortalis doclea, are another import from Australia and in my domain are becoming much more common. Here they are mating. Assuming the male is on top, I observed the female doing the 45 degree rotation that was observed here and assumed to be part of the male display. I have my camera set for bracketing, taking three exposures in succession. In this set, notice the drop of liquid that moves forward on the female's (again, assuming she is on the bottom) proboscis. The size and shape of the head appears significantly different between the sexes as shown in the top photo.
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