PROC CAL. ACAD. SCI.. 4th Series. \ 



fVANDENBURGH&SLeviNIPiMei? 



Map showing the distrihiitioii of gartcr-snakfs chiefUr of the elrgans group, in the stales west o( Hie Rocky Monntai 

 Crescents imlicato T. a. orditioidfs 

 Round inarks " " " atralus 



Half roniids ' flfgaus 



Triangles " " " vagratis t. •• T. angustiroslrh 



Intergradcs are shown by similar marks with liglit 



Crosics 





