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Thank you very much for the ID.
I've read in the key of M.van Veen that M.vicaria has tergite 5 with hairs at an angle of 90 degrees. As I saw it again yesterday, I took some photos to try to show that feature.
The length of the body is exactly 8mm.

They were again 3 A.clarkella female with empty abdomen, but with only a little hole (2 or 3mm) at the end of the abdomen. They were alive on the ground.