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Does these others photos of the wings help ? What features do you try to see ?
Today, the Myopa was nearly at trhe same place. Weather very cold (4?C), and - 5?C during the night. The night after I found it, it began to snow (10cm) and yesterday the snow was still there.

For the Andrena clarkella, you are right, there are no exuvium within the abdomen.
An idea of what could happened to them ?