40. THAMNOPHIS 837 
mens collected at Klamath Lake in southern Oregon. 1 
have examined specimens from Vancouver Island, from 
Lillooet River Valley, British Columbia, the San Juan 
Islands and King County, Washington, the South Fork of 
the Coquille River, twenty miles above Myrtle Point, Coos 
County, Oregon, the Rogue River near Grants Pass, 
Josephine County, Oregon, Klamath Falls, Klamath Coun- 
ty, and Lakeview, Lake County, Oregon, Gasquet, Del 
Norte County, California, Lower Klamath Lake, Siskiyou 
County, California, and Davis Creek and Goose Lake, 
Modoc County, California. 
Specimens from northwestern Nevada, as those from 
the Pine Forest Mountains, Virgin Valley, and Quinn 
River Crossing, in Humboldt County, appear to be inter- 
mediate between this form and true T. 0. vagrans, the color- 
ation being typical of the latter, while a tendency toward 
an increase in the number of preoculars is still present. 
These are listed with T. 0. vagrans. 
Specimens from Grasshopper and Eagle lakes, Lassen 
County, California, are intermediate between this subspecies 
and T. o. elegans. 
Remarks.—These snakes from the Klamath region are 
very similar to T. 0. vagrans, but the ground color of the 
dorso-lateral regions usually is much darker. For this 
reason the dark spots usually are inconspicuous. Occasional 
specimens show the spots very distinctly, and in most speci- 
mens they may be seen when looked for. These spots 
invade the dorsal line just as they do in typical T. 0. vag- 
rans. The chief point of distinction between T. 0. biscutatus 
and T. o. vagrans is the increase in the number of preocu- 
lars. Less than twenty-five per cent of the Klamath speci- 
mens do not show this increase on at least one side of the 
head, so that it must be regarded as a perfectly good sub- 
