"At first glance, spotted bass are almost indistinguishable from largemouths. A second look at a few telltale characteristics makes identification easy, though. Spotted bass usually have a sandpaper-like tooth patch on the tongue, which largemouths lack. Also, the rear of the jaw does not extend behind the eye as it does in largemouths, and finally, the spiny and soft dorsal fins are connected with a shallow notch not reaching all the way to the body."
Taken from http://www.georgiasportsmanmag.com/fishing/bass-fishing/GA_0505_01/
Here is an id page with pictures!http://www.bassfishingnetwork.com/articles/bassid.html