Quantitative collecting efforts over the last several decades in Costa Rica have resulted in many new species of insects. The Arthropods of La Selva projects included collecting from a typical lowland Neotropical forest and up an altitudinal transect, and has provided many valuable samples of insects, spiders and mites potentially new to science. We describe 18 new species in the bark beetle genus Scolytodes Ferrari, 1867, 14 of which were collected during this project: S. angulus Jordal & Kirkendall, sp. nov., S. sufflatus Jordal & Kirkendall, sp. nov., S. squamatifrons Jordal & Kirkendall, sp. nov., S. comosus Jordal & Kirkendall, sp. nov., S. spatulatus Jordal & Kirkendall, sp. nov., S. seriatus Jordal & Kirkendall, sp. nov., S. profundus Jordal & Kirkendall, sp. nov., S. catinus Jordal & Kirkendall, sp. nov., S. fimbriatus Jordal & Kirkendall, sp. nov., S. sulcifrons Jordal & Kirkendall, sp. nov., S. planifrons Jordal & Kirkendall, sp. nov., S. porosus Jordal & Kirkendall, sp. nov., S. mundus Jordal & Kirkendall, sp. nov., S. callosus Jordal & Kirkendall, sp. nov., S. parvipilus Jordal & Kirkendall, sp. nov., S. plenus Jordal & Kirkendall, sp. nov., S. niger Jordal & Kirkendall, sp. nov., and S. simplex Jordal & Kirkendall, sp. nov. One species, Scolytodes minutissimus Schedl, 1952, is redescribed to match the holotype. We give new Costa Rica records for S. costabilis Wood, 1974, which is the correct name for S. obesus Wood, 1975 (syn. nov.). We report Costa Rica as a new country record for six species: Scolytodes clusiacolens Wood, 1967, S. crinalis Wood, 1978, S. culcitatus (Blandford, 1897), S. libidus Wood, 1978, S. reticulatus (Wood, 1961), and S. spadix (Blackman, 1943). From a closely related genus, we provide the first record for Central America (and only the second collection) of Pycnarthrum fulgidum Wood, 1977.