RTPBearcat, You are correct with your description of pygmies in FL, they are darker because they are a different species. There are three different species of pygmy rattlesnakes in the southeastern U.S. The Dusky pygmy which ranges in all of Florida and extreme southern AL and GA. The Carolina pygmy which ranges in most all of SC, southern NC and in central GA into east central AL. Then you have the Western pygmy which ranges from western AL through Most all of MS, AR, and LA and into eastern OK and TX. Then you have the "spin", all three of these species come together in Alabama as their ranges overlap. Also the Dusky and Carolina ranges overlap in GA
