Thanks MU see link:University of Missouri Extension
I didn't see any honey bees on the flowers, although I did see many bees flying in and out of my hives. The temperature is low, for bees, at about 55F.
I believe this is pollen coming into the hive.
I think this is maple pollen. My wife says she saw bees on a maple tree in our neighborhood. Below is a picture of the flower buds. I didn't see any bees on this tree, nor did I see any open flower buds on this tree but there must be somewhere on the canopy or on other trees.
Here is a link to Wikipedia that I use to help identify individual pollens. http://en.wikipedia.org/wiki/Pollen_source
Spring fever has officially started.