http://www.flickr.com/photos/41142725@N07/
Follow link to Joe Turne'rs Flicker site for some pics of the kites.
The perched bird and the flying bird  in the center top row are of the
sub-adult.
The bird underneath is an adult.
Notice the tail and under-wing covert markings on the sub-adult.
Thanks to Joe Turner for taking and posting these good pics.
-- 
Donald Sweig
Falls Church, Va.