1983 10 February (continued) of the Arboretum, then back to station. Left ~ 1300 hr w/ Brian, a British M.D. & mature photographers. At 1320hr, ~290m on the East Rice Road, saw a greenish snake going off the trail into forest and managed to grab a =1m Pseustes poecilonotus, w/ considerable squeezing and poking it formed an S-coil, gaped, and inflated anterior part of body, and then struck. Would not sustain the threat display more than 1-2 seconds after each passing, but instead tried to crawl away whenever possible. Went to ~380m on Hartshorn Trail via CCL-released Bothrops schlegeli (SV 495mm, tail 93mm, 36 g) on a vine and photographed it. Walked across the Sendero El Suampo, over to the Sabalo Espina Trail and out it to the Veneipelo stump at 1750m-no Bothrops asper. Cloudy and saw no Rhinodermys on the logs over the creek. At ~1532hr, SOR 640 m, saw a Dendrophidion winitzi go off the trail fast and into a ditch and grabbed it. Beautiful snake! Copper head, yellow belly. Deflated, S-coil, then bite and hold on, chewing and interlocking posterior teeth. 11 February Doug Jerey brought me a Rhadinodera decorata,