1983 3 February (continued) out the camino experimental to see a hummingbird, Florisuga mellivora (white-necked Jacobin), on a nest on a short palm beside the trail. Took photos. This was same species, the ♀ of which we saw this morning just before the waterfall on the Quebrada El Salto. Robin and Rob Colwell went back to the station, and I walked til ~1500. Went out to ~100m on the West Boundary Trail, then returned and completed the loop of the camino experimental, then out to the arboretum and back. Saw nothing but Ameira. 4 February Left by myself at 0730 h, walked by way of Far Jump Trail to Lachesis site at 750m on the Sendero El Swamp. Snake not in sight and I looked all over the slope w/out finding it - a little creepy! Next walked to 700m on the camino central, found the bridge out, and returned via Sendero El Swamp and Goldlodge Trails. No fresh jaguar tracks in swamp. Near the bridge just before leaving swamp, was heckled by 4-6 white faced monkeys. Saw a squirrel too. Went to Puerto Viejo after lunch for kerosene. Forest has seemed extremely dry, except for swamp, but we had some brief showers today. 5 February Left of Jeda Muñoz at ~0900. Went by way of camino circular, dejavo to the camino central and then to 750m on the Sendero El Swamp. Looked all over slope and among logs, but couldn't find the Lachesis.