No, I'm not feeding dry sugar, which is why I was curious. I can only think that it is crystalized honey. I extracted some honey from last year's deadouts to feed to them in late summer, and some of that honey was cloudy from beginning to crystalize. But even so, bees will use dry/crystalized sugar so I would have thought that they wouldn't be getting rid of this. It is not in large quantities by any means, just scatterings like in the photo.