16. CROTALID.T 



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; Entlat 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 Steptoc 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; and in the White Mountains, 

 Apache County. It is not restricted to the higher elevations, 



