WEC291, a 3-page illustrated fact sheet by Laura M. Early, Christy A. Harry, Rebecca G. Harvey, and Frank J. Mazzotti, provides color-coded visual reference and details for identification of non-native lizards and snakes and their native look-alikes. Published by the UF Department of Wildlife Ecology and Conservation, August 2010.
http://edis.ifas.ufl.edu/uw336