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"Sometimes it is red with freshly hatched (teneral) flies." Yes. I have seen it. But in some species the yellow color seems to remain? Or am I wrong?
For example, vulpina that I can see for a long time in my garden. I have never seen a vulpina with a black frontal stripe. And also the pictures in the gallery show yellow frontal stripe.

With vulpina I have no problems. Nor the bone color.

I wonder about the color of the abdomen. Just for knowledge.
In which species of Linnaea can the abdomen completely lack red in the females? Not vulpina from what I've seen. But among the others?

The gallery does not provide an answer.