Greene, H. 1989 June 9 (continued) The only likely shelters for Sistrurus I saw appeared to be kangaroo rat burrows, which at this place are clustered into mounds. I noticed a few wallow-like depressions, roughly circular and a few meters across w/ different vegetation, that Barney says fill w/ water during the monsoon. There is a fair amount of tin and boards around the mine, but all such that underneath would be far too hot for a small rattler. Digging out we saw that there is an obvious marshy area at the valley's low point, in the middle of the S-curve -- precisely where one most frequently finds Sistrurus and Thamnophis marcianus. My bet is the massasaugas stay there through the cold and dry part of the year, and move outward up the valley slopes of grassland during the monsoons. Barney and Tony had previously found an adult Crotalus atrox and Pituophis under a rusty abandoned truck at the mine, and many C. sentalatus in the grassland below -- either lying out or in the mouths of K-rat burrows. Poital, Chiricahua Mtns., Cochise Co., Arizona at 1630 hr I could see the side of the body of the telemetered Crotalus molossus , against the entrance of the hole he has been in all week. Hot's sunny, tho even now the hole is in shade. Claudia and I