936 16. CROTALIDA 
Harney, Burns, Silvies River, Diamond), and Gilliam 
(Lonerock, Willows), counties, and from the Blue Moun- 
tains and Columbia River. 
In Washington, it has been collected at Fort Walla Wal- 
la, Walla Walla County; near Springdale, Stevens Coun- 
ty; Grand Dalles, Klickitat County; Entiat and Chelan, 
Chelan County; Omak Lake, Okanogan County; Skamania 
County; and on Wenass River, Snake River, Pelouse River, 
Spokane River, Grande Ronde River, and in Yakima Valley. 
In Idaho, specimens have been secured in Jerome (Blue 
Lakes Canyon), Twin Falls (Twin Falls), and Butte (Big 
Butte, and Little Lost River), counties. 
In Utah, this rattlesnake has been collected in Cache, 
Salt Lake (Fort Douglas), Utah (Provo), Wasatch (in the 
Wasatch Mountains), Grand (Thompson), Millard (seven 
miles south from Kanosh, Deseret City), Beaver, 15 miles 
north from Beaver), Iron (Rush Lake, Buckhorn Hills), 
and Washington (Springdale), counties, and in Steptoe Val- 
ley. 
In Nevada, it has been found at Mountain City and 
Lamoille, Elko County; Cortez Mountains, Eureka Coun- 
ty; Virgin Valley, Pine Forest Mountains, and Quinn River 
Crossing, in Humboldt County; on Anaho Island in Pyra- 
mid Lake, at the Pyramid Lake Indian Agency, and the 
Truckee River, Washoe County; at 6,000 feet on Peavine 
Creek, Toiyabe Mountains, Nye County; and in Snake Val- 
ley. 
In Arizona, Crotalus oreganus seems to be most often 
met in the more elevated regions, where it has been obtained 
at San Francisco Mountain and Oak Creek, Coconino Coun- 
ty; Cave Creek, Maricopa County; Mount Lemmon, Cata- 
lina Mountains, Pima County; andin the White Mountains, 
Apache County. It is not restricted to the higher elevations, 
