Peculiar yellow bee

This character is bigger than a honeybee but a little smaller than a bumble bee -- and all the fur on its back is yellow, none of the black of the bumblebee. When I saw it, I only had the little zoom, not the macro lens, and this is as big as I could get it and, alas, as sharp. But I'd never seen one of these before, so until I get another picture, I thought I'd put this one up.