Michael Ackland wrote:
It is definitely a female anthomyiid. I will make a quess (risky with photos) and say that it might be a Lasiomma species, because I can see in the excellent photos two anterior katepisternal setae, not common in Anthomyiidae. The rather distinct vittae on the scutum look like L. strigilatum Zett., which appears early in the year. In one photo I can see at the bottom of the right eye what could be fine pale hairs That's where the name Lasiomma comes from, though not all species have hairy eyes.