Aceve, ld. 1982 18 March (continued) At 0953 we saw a Caiman crocodylus ≤1.5m total length swim downstream a few meters, until just below us on the little bridge where the Quebrada El Surá crosses the Old-South West Boundary Trail. Rather black looking, and the head quite cryptic when resting on the surface. I took one picture and was moving closer when it suddenly snapped its jaws, thrashed and swam upstream and out of sight into some vegetation ≈15m away. Stream here is a few meters wide and less than 0.5m deep. After stopping at station for refresco, we (Manuel Sartena t & I) walked the East River Rd & Far Jorp Trail til it crossed the Quebrada El Salto. On the way back, at about 50 m from the East West R. Trail or Loop trail, I caught a small adult Mastigodryas melanotus crawling rapidly on the trail away from me at 1146. It thrashed, spun, bit repeatedly, and smelled bad. From 1945-2200 walked w/ Ricki VanBierum, Manuel Sarteno, and Beth Breker, - went to Rio Puerto Viejo by "Rafael's House" - found Smilisca baudini sitting on tree limb, 2m above ground. Then walked to Q. El Salto on Far Jorp Trail, where Manuel and I waded downstream to the rapids, searching both banks for herps. Saw none. Beth found a hybrid on a low palm near the stream, and a green-boned hybrid (?) near the Puerto Viejo - too dry for herps tonight?