Greene, H. 1990 August 10 Ned Hall of Rodeo, New Mexico. Both snakes he saw (Continued) were abroad after dark. August 11 Morning overcast. I hiked across the entire canyon face north of Paradise Rd., searching for Grotelus molossus #1 and re-learning Rule#2 of stupid Things not to do when radiotracking; never leave a comfortable substrate for an uncomfortable substrate until you have carefully bi-articulated the signal! (Rule #1 is Dial in the right Frequency). After ~ 1 1/2hr I gave up near the head of an agave at the east end of the curved ridge, because - initially thinking I was close - I'd left pack, water, etc. in the truck and was overheating. At 1140 hr I located #3 under the same agave plant as yesterday except now his head and body were partially exposed. Between 1630- 1800 hr we searched grassland just north of Portal Rd., between U.S. 80 and the State line in Hidalgo Co., New Mexico. First went to Rodeo for permission from Ned Hall, a taciturn rancher in his 70's or 80's. Mrs. Hall invited me in and was friendly; Ned Hall was shirtless, eating a bowl of soup, allowed that "they study everything these days," and said to kill all the rattlers I want to! The site is open grassland w/ scattered brush and yucca, and numerous mounds of Dipodomysspectabilis - a plausible Sistrurus site. Saw only Sceloporus undulatus and a large ? Phrynosoma cornutum