Bogert, Charles M. (Charles Mitchill), 1908-1992.2005-10-062005-10-061945http://hdl.handle.net/2246/377614 p. : ill., map ; 24 cm.Includes bibliographical references (p. 12)."Five subspecies of Salvadora hexalepis, two of them described herein, are recognized. The known ranges of the races are mapped, and it is shown that one scale character of diagnostic importance varies from south to north as a 'step cline' when populations are segregated primarily on pattern characters. A key to the races is supplied"--P. 12.1999187 bytesapplication/pdfen-USQL1 .A436 no. 1285 1945Salvadora hexalepis klauberi -- Classification.Salvadora hexalepis mojavensis -- Classification.Salvadora (Genus) -- Classification.Snakes -- Southwest, New -- Classification.Snakes -- Mexico, North -- Classification.Snakes -- Southwestern States -- Classification.Reptiles -- Southwest, New -- Classification.Reptiles -- Mexico, North -- Classification.Reptiles -- Southwestern States -- Classification.text