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 Bafios, 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 7. 0. 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 7. 0. ham- 
mondit, 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. 
