Here, H. 1990 June 23 (continued) seized. At 2120 hrs, 150 CES, Dave spotted an Iwamotodes cenchoa (11.1g, 575+191mm) in leaves beside the trail. At 2155hrs I saw an adult Leptodeira septentrionalis at >3m above water, in a tree in the Sendero Cantarana swamp, crawling slowly, moving the head laterally on the limb surface and tongue flicking. June 24 This afternoon Dave and Billie Hardy and I walked out the CES, SAT, and Sendero Rikeseño to the holly car across the Rio Sarapiguí, then back via SJV and SOC. At 1415hrs near the beginning of Sendero Alto we startled a juvenile ♀ Bothrops asper in the trail - she had an aberrant striped pattern which Dave photographed, and seemed thin. June 25 Today I lead three orientation walks for the O.T.S. tropical biology course - the first around the loop trail (CCC & CCL) and each of the others out SOR to ≈ Holdidge 600m. Saw no snakes. June 26 Dave and Billie and I walked out SOR to Holdidge, then over the Sendero El Swampo and back via Carroiro Central and CCL. There was a hard rain during and after breakfast, so the strong cat urine smell at SUA 190m had to be fresh at 1020 hrs. At 1030hrs, SUA 350m, I found a very fresh large cat scat. Shortly, thereafter we found Panthera onca tracks in mud between the trail and stream ≈ 500 m on SUA. There were two sizes of tracks: