40. THAMNOPHIS 841 



Monterey County, where it has been taken in the valleys 

 of the Carmel River and San Antonio and Nacimiento 

 creeks. It ascends the valley of the Kern River to an alti- 

 tude of some 6,000 feet, and, doubtless, crosses through 

 Walker Pass to the east side of the Sierra Nevada where it 

 occurs in Owens Valley and about Pyramid Lake and Lake 

 Tahoe. Its range lies chiefly in the Lower and Upper 

 Sonoran zones. 



I have examined specimens as follows: 



From California, Monterey (Carmel Valley, San An- 

 tonio Creek near Mission San Antonio, Nacimiento Creek), 

 Shasta (Cottonwood, Long's Ranch Battle Creek), Glenn 

 (Orland, Stoney Creek), Yuba (Strawberry Valley), Placer 

 (Red Point), El Dorado (Fyffe, Riverton), Tuolumne 

 (Priest Hill), Mariposa (Pleasant Valley, Yosemite Valley), 

 Merced (Los Baiios, Gadwall), Madera (Raymond), Fresno 

 (Hume, Fresno), Tulare (Trout Meadows, Little Kern 

 River Lake, Trout Creek at 6,000 feet, Cannell Meadows), 

 Kern (Buena Vista Lake, Kern River near Bodfish, Walker's 

 Basin), Inyo (Owen's Valley, Laws), El Dorado (Lake 

 Tahoe, Fallen Leaf Lake, Mt. Tallac), and Placer (Tahoe 

 City) counties. 



From Nevada, from Douglas (Glenbrook), and Washoe 

 (Wadsworth, Pyramid Lake), counties. 



Remarks. Certain specimens resemble T. o. hammondii 

 rather closely, but the presence of a dorsal line on at least 

 a portion of the neck will usually serve to distinguish them 

 from that form. Sometimes the line is continued along 

 the back, but it often is very indistinct. The gastrosteges 

 seem to be somewhat more numerous than in T. o. ham- 

 mondii, and a similar tendency is apparent in the infralabials, 

 which often are eleven instead of 10. On the other hand, 

 two preoculars are found much less frequently than in T. o. 



