It is not M. maculariformis because there is no sign of orange on the face or end of the abdomen. I am unsure of exactly which flower species that is, but the bee looks fairly small, so my guess is that she is M. serricauda (9 mm rather than 12 mm for maculariformis).
Thanks Michael, I am going to post a couple of images that I think are (maculariformis), this bee was taken at the same time time, same flower, a Pea, and what I though was about the same size.
Assuming the leaves are all roughly the same size, I estimate that the M. maculariformis in sighting 4424441 is 25% larger than this bee, which makes it virtually certain that this is M. serricauda.