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Oke, let's slow down.

First of all, M. umbellatarum is not an early spring species.

Secondly, M. quadrimacualata does not have comma-shaped markings, so your description does not fit.

Thirdly, hibernation of Scaeva pyrastri is quite unusual, whereas it is common in Sc. selenitica. At least in The Netherlands.

Fourthly, I'm not sure about the picture. It is a Scaeva no doubt, but given the point of view I cannot be sure about the species. It could be Sc. pyrastri.

Still, seeing many pyrastri and no selenitica at all on a day in March does seem quite unlikely to me.

So, be sure to check !


Theo