1922] Schmidt, Amphibians and Reptiles of Lower California 693 



They agree with the specimen described by Van Denburgh and 

 Slevin (1921a, p. 68) in the disposition of the head shields, with the -ex- 

 ception that there are two preoculars, a small inferior and a large 

 superior, in each. 



Natrix valida (Kennicott) 



Regina valida Kennicott, 1860, p. 334. 



Natrix valida Stejneger and Barbour, 1917, p. 97. 



Range. — Western Mexico, Lower California. 



Lower Californian Records. — Cape St. Lucas, Cope, 1860a, p. 341; La Paz, 

 Yarrow, 1882, p. 132; San Jose del Cabo, Miraflores, Van Denburgh, 1895, p. 154; 

 Mount San Rafael (near Agua Caliente), Santiago, Van Denburgh and Slevin, 

 1921a, p. 68. 



The six specimens in the Albatross collection from San Jose del 

 Cabo (A. M. N. H. Nos. 5573, 5581, 5583, U. S. N. M. No. 64582) 

 and Miraflores (A. M. N. H. Nos. 5604-5) present no variation not 

 already known in this species. 



One specimen in the Biological Survey collection comes from San 

 Jose del Cabo (U. S. N. M. No. 37545). 



Thamnophis ordinoides vagrans (Baird and Girard) 



Eutsenia vagrans Baird and Girard, 1853, p. 35. 



Thamnophis ordinoides vagrans Van Denburgh and Slevin, 1918, p. 240. 



Range. — Eastern Washington and Oregon, Idaho, south to northern Arizona 

 and eastern California, reappearing in the San Pedro Martir Mountains, Lower 

 California. 



Lower Californian Records. — San Pedro Martir Mountain, Van Denburgh. 

 1896, p. 1007. 



Thamnophis ordinoides hammondii (Kennicott) 



Eutsenia hammondii Kennicott, 1860, p. 322. 



Thamnophis ordinoides hammondii Van Denburgh and Slevin, 1918, p. 256. 



Range. — Southwestern Lower California and northwestern Lower California. 



Lower Californian Records.- — Comondu, Van Denburgh, 1896, p. 1008; 

 Mulege, San Ignacio, Mocquard, 1899, p. 327; San Antonio, La Grulla, Ruthven, 

 1908, p. 133. 



Four specimens in the Biological Survey collection come from 

 Hanson Laguna (U. S. N. M. Nos. 37542-4) and Ensenada (37541). 



Thamnophis megalops (Kennicott) 



Eutsenia megalops Kennicott, 1860, p. 33. 



Thamnophis megalops Stejneger and Barbour, 1917, p. 101. 



Range. — The Mexican Plateau region, north to southern Arizona and New 

 Mexico, west to Yuma, Arizona, and the Cocopah Mountains, Lower California. 



