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



T. s. conchuuis are referred snakes from Del Norte, Siskiyou, 

 Shasta, Humboldt, Mendocino, Sonoma, Napa, and Marin 

 counties, while those from elsewhere in California are regarded 

 as T. s. infernalis. 



There is much variation in color. Certain types of colora- 

 tion seem to be more frequent in certain localities than else- 

 where. Thus, the majority of the snakes from the San Joaquin 

 and Sacramento valleys and the Klamath region dififer in ap- 

 pearance from those from Santa Clara County and the southern 

 coast. Much larger series might perhaps throw light upon 

 these conditions, which now are obscure. 



Some specimens have bright red heads. Others, perhaps of 

 the same lot, have no red, or heads that are partially red. The 

 red-headed snakes are of both sexes, various ages, and all sorts 

 of localities. 



One specimen had eaten a full-grown toad. 



Thamnophis eques (Reuss) 



Diagnosis. — Squamation similar to that of the other mem- 

 bers of the sirtalis group but supralabials usually eight ; prom- 

 inent dark nuchal blotches. 



Type Locality. — Mexico. 



Range. — This snake occurs in the United States in Arizona, 

 New Mexico and western Texas. Thence it ranges south 

 through Mexico to Guatemala. In Arizona it has been found 

 in the plateau region and about the foothills of various moun- 

 tain groups. Ruthven has recorded it from Fort Apache, Fort 

 Huachuca, White River Canyon, Sabino Canyon, and Fort 

 Whipple, Arizona. 



We have examined specimens from the following localities : 



1. Cave Creek, Maricopa Co., Arizona. 



2. Oak Creek, Coconino Co., Ariz. 



3. Sabino Canyon, Santa Catalina Mountains, Pima Co., 

 Ariz. 



4. Steam pump, foothills of the Catalina Mountains, 18 miles, 

 north of Tucson, Pima Co., Ariz. 



