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Steve, I am afraid that is an aberration :o I photographed other specimens (all feeding in the same flowers at the same time) and they all look the same but for that little thing :( It is a pity because that would be something quite diagnostic, not commonly seen in Tachinids as a reliable feature, I believe.

I have been checking and not even have in focus pictures of the face. The best I can show is a close up of the picture showing the palps. They are indeed yellow.