A worldwide community photographing and learning about wildlife
Metcalfa pruinosa (Say)
I think the 'tail' is uric acid crystals...
http://www.flickr.com/photos/spidermanbr...
This is a nymph of a leafhopper.
They often produce waxy or fluffy projections to make them hard to eat, or easy to hide.
Here is a similar one I found http://www.projectnoah.org/spottings/897...
Woww... nice shot... i think it would help if you could tell us where u found this... on which plant...etc...