The basic color patterns of Florida tree snails of the genus Liguus (Mollusca: Gastropoda, Bulimulidae) show little correlation with environmental conditions. The occurrence of distinctive variants in "pure colonies" suggests that the basic pattern and pigments are directly controlled by a relatively few genes. The segregation of various elements of the basic patterns among the colonies of the Lower Florida Keys and mainland can be used as the basis for an hypothesis concerning the genetic control of axial coloration, banding, pigmentation, and other characters. A new form from Little Torch Key, Liguus fasciatus vonpaulseni new subspecies, combining many of the color pattern elements previously known from the Florida Keys is described and figured. This form is presumably close to the ancestral form that migrated to Florida from Cuba. A key to the described forms of Liguus from the Florida Keys illustrates the known combiniations of color pattern elements.