208 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



7. T. ordinoidcs clcgans is confined to the Sierra Nevada 

 and the mountains of southern California, excluding the lower 

 levels. 



8. T. ordinoidcs clcgans in the mountains of southern Cali- 

 fornia remains true to type. No specimens showing signs of 

 intergradation have been taken. 



9. In the Sierra Nevada, however, intergradation occurs and 

 one may be in doubt wdiether to refer a particular specimen to 

 clcgans or to vagrans or couchii. 



10. The Sierra Nevada snakes of pure clcgans type seem not 

 to occur at the lower altitudes, but material is insufficient for 

 proof. 



11. The snakes from the lower Sierra Nevada and the San 

 Joaquin Valley, which have been referred sometimes to vagrans, 

 sometimes to hanimondii, are neither. 



12. They combine characters of both vagrans and hani- 

 mondii in varying proportion. 



13. They may best be regarded as a separate, though inter- 

 mediate, subspecies. 



14. This may be called T. ordinoidcs couchii. 



15. The range or T. o. couchii extends from Shasta County 

 south through the San Joaquin Valley, and, east of the Sierra 

 Nevada, from Owen's Lake to Lake Tahoe, and Pyramid Lake. 



16. Snakes of this type occur also in the warmer parts of 

 Monterey County. 



17. Thamnophis ordinoidcs hanimondii, of pure type, ranges 

 north to the Mohave River and to southern San Luis Obispo 

 County. 



18. T. 0. hammondii may have a nuchal spot, put has no dor- 

 sal line, not even a rudimentary one. 



19. In the mountains of southern California elegans and 

 haniniov.dii may be found together; but only hammondii has 

 been taken at lower altitudes. 



20. No intergradation between hanimondii and clcgans has 

 been found in southern California. 



21. Farther north such intergradation occurs through 

 couchii. 



22. The snakes of the Klamath and Modoc region usually 

 have more than one preocular. 



