In the light of our present knowledge, therefore, it seems necessary to regard Anniella nigra as a local and probably recently differentiated race rather than as a melanistic phase of Anniella pulchra. While the difference is purely one of color, no intergradation has yet been shown to occur in adult specimens, and the two forms must therefore be recognized as distinct species occupying separate areas in different faunal zones.
If then we ignore the localities of the type specimens of "A. texana" and A. nigra, as open to question until confirmed by the finding of additional specimens, the known distribution of the species of the genus Anniella is as follows:
Anniella pulchra.
Upper Austral Zone.
San Diegan Fauna.
San Diego County.
San Diego, Coronado, mountains near San Diego.
Riverside County.
San Jacinto.