Arnold, Steve 1963 JOURNAL April 9 Mountain Palm Springs, Auza-Borrego State Park, San Diego Co., California : Creosote and ocitillo on the alluvial fan but no Spanish Dagger. Drove east to Yuma, Yuma Co., Arizons — south to San Luis, Yuma Co. and crossed the border to San Luis, Sonora, Mexico. Stopped about 20 miles east of San Luis, Sonora — Yuma Desert, flat plain with reddish- brown soil — small sand dunes with scattered creosotes. Excavated a sand dune approx 15' long and 8' wide, 2 ½' in height — sand somewhat damp below surface — no specimens taken. From dusk to 9:30 PM (Pacific Stand. Time) drove Highway 2 in Sonoras from east of San Luis to Sonoyta. Drove south of Sonoyta 5 miles then turned around drove back to Sonoyta and crossed the Arizons- Mexico border at Lukeville, Pima Co., Arizona. American official at check station said he had seen no snakes on the roads in the monument but latter in the year they were quite common. He reported seeing Heloderma on two occasions south of Quintobazquinto, Pima Co., Arizona on Highway 2 in Sonoras. Slept in Organ Pipe Cactus Nat'l Monument, Pima Co., Arizona April 10 Drove to a Mexican check station 5 miles south of Sonoyta, Sonora, Mexico. Officials reported seeing many snakes in the area but no Heloderma (El Scorpion). Sonoran Desert — bajadas with mountains in all directions. Walked S.W. from the check station