N. Stone 1941 Aug. 1 west side Colorado R, 500 ft., 6 mi. N Calif. line, Clark Co., Nev. mouse traps. I put out 58 traps & caught: Perognathus formosus 15♀ 15♂ 2? Dipodomys merriami 7♀ 3♂ We are camped in riparian growth. The dominant plants are Salix, Screwbean, Catalou. There is a fairly heavy growth of a 2-4' woody annual & some grass. Out on the dessert to the W of camp, Creosote Bush is the dominant plant. Aug. 2 west side Colorado R, 460 ft., 1 mi. N Calif. line, Clark Co., Nev. Last night G. Bartholomew and I drove to this locality to set out traps. On the way I shot 1 Dipodomys merriami & 1 Por Will. As I was setting out my traps I set one down on a Rattlesnake - we were both surprised. He retreated into a Creosote Bush rattling his rattle furiously. I watched him (within the) for 35 min. Not once did he cease his rattling. At times he would slow down but when I moved he stared furiously again. Leaving my trap pack I went back to camp & got a shotgun, flashlight & Bartholomew. I pulled him into sight with the shotgun & shot him in the neck with .22 shot shell. Then I set out the rest of my 100 traps. I set my