Good for you,
@greene! The University of Florida site is the one that I have come to swear by. And you're right …There are many variations in the appearance of this guy, from what I've seen…Juvenile, to adult…Can be very hard to tell. These two have become my "go to"…
http://ufwildlife.ifas.ufl.edu...
and
http://www.wec.ufl.edu/extensi...