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Thanks for your help Johanna.
I don´t think tibia realy are yellowish thought it seems so in pictures,
It could be an artefact from flash or even dust from the sandy environment.
I have same yellowish looking tibia on one of my pictures of Leucophora obtusa from 160521
See pictures on link https://www.artportalen.se/Image/1559316
I can´t see any observations of Delia albula from Swedish site Artportalen, and this is not a coastal site.

Kurt Holmqvist