Attachment 3153Bombus pennsylvanicus, the American Bumble Bee. They are fun to watch, but can and will sting multiple times to defend their nest if provoked.
Here are some great resources:
http://entnemdept.ufl.edu/creatures/...umble_bees.htm
http://bugguide.net/node/view/65631#id
http://www.bumblebee.org/NorthAmerica.htm
Attachment 3152
