With 126 recorded species, La Selva Biological Station has one of the highest known species diversity levels of katydids (Orthoptera: Tettigoniidae) of any site in the world, second only to Explorama Lodge site in Peru. Between 1993 and 2003 katydids were collected using blacklight, mercury vapor lamp, canopy fogging, Malaise traps, and visual search at night. Blacklight and mercury vapor light were the most efficient methods for collecting members of the subfamilies Listroscelidinae and Phaneropterinae (68 spp.), whereas Pseudophyllinae could only be collected by a visual search (37 spp.). Canopy fogging yielded only 30 species of katydids (mostly Conocephalinae and Phaneropterinae), of which only 1 species could not be collected by any other method. Malaise traps recovered only 5 species, all of which are usually associated with disturbed habitats. The species accumulation curve has not reached a clear asymptote and additional species are still being collected. Approximately 19% of katydid species at La Selva are new to science.