Greene, W. 1983 26 June (continued) got a good look, and recognized it. Once pinned, it thrashed, struck forcefully w/ open mouth, and tried to nipole me w/ the large rear teeth when held. 2 July For past several days have worked in lab and checked small Lachesis many times. ~0800h this morning George Schatz (U. Wisconsin, Botany) and Doug Jevey (U. Wisconsin, Zology) saw a Lachesis at ~600 and 550 m respectively, on the C.C.C. trail. Snake lunged from trail- side at George, and was crawling up the trail when Doug encountered it (?) a few minutes later. When we arrived, the snake was in a tight round coil w/ head in center and down, ~1 m off trail in leaves. Hard to see, tho exposed. When I touched it w/ a potato rake it jerkily flopped out of the coil and started into forest. I hooked it out onto trail and after ~5 minutes of maneuvering, we got it into a ~10 gal garbage can. Still wouldn't call it an aggressive snake. 3 July Big event of today was putting a radio in the Lachesis after lunch. It measured ~1.7 m total length, weighed 1.6g, &? Took ~5 minutes to do everything w/ one holding the head, Craig Guyer