There have been a number of questions today regarding the colors on the flood map. The above key can be found on the Layer Tab. For general reference AE, AO and VE zones represent 1% storm impact areas and trigger flood insurance requirements. The Q3 layers represent existing flood zones and are solid colors on the map. The Preliminary 2013 zones (tentative effective date June 2014) are striped.
Note the X500 (yellow) is turned off in my example, these areas are irrelevant to the flood insurance discussion.