Greene, H. 1992 March 7 (continued) in the care. Several carnivore scats on edges of the Neotoma stuff. F15's, mothes, in care. San Simon Cienega, Hidalgo Co., New Mexico We arrived here #/430h w/ Barney Tonberlin to check out a rattlesnake den in a cottonwood tree! There is a line of scattered cottonwood groves and we stopped close to the east end at a huge, broken up but still living tree. On the SW side there is a large cavity, filled w/ an apparent Neotoma nest # w/ at least 3 cavities, 1 extending >=1.5m down and out of sight around a turn. Rosting in tight coils were two visible Crotalus atrox and a third snake we could scarcely see under the ranges of the other two. Total lengths were #70cm to >=1.1 m. After some photographs the snakes cautiously crawled down out of sight, rattling as they disappeared from on top of the chips of the rat nest down into two of the holes. Bright sun, so the wood chips were undoubtedly warm. San Simon Cienega, Cochise Co., Arizona We arrived at a sight <=5 miles NW of the previous locality, parked at a fence that's on the state line, and climbed into Arizona. This is an earthen dike that extends >=200m out to a spillway, in the midst of the seasonally flooded Cienega. The surrounding area is flatland with dense, lush creosote bush the dominant plant. Granite Gap dominates one horizon, the Chiricahuas another. Around the concrete spillway abutment