Revision of van der Wulp (Diptera: Tachinidae) and twenty-five new species from Area de Conservación Guanacaste in northwestern Costa Rica with a key to Mesoamerican species.

Background: We describe 25 new species in the genus van der Wulp, 1890 from Area de Conservación Guanacaste (ACG) in northwestern Costa Rica. All species herein described were reared from an ongoing inventory of wild-caught caterpillars spanning two families (Lepidoptera: Crambidae, and Tortricidae). Our study provides a concise description of each new species using morphology, life history, molecular data, and photographic documentation; a redescription of the genus, and its type species as well as a revised key to species of occurring in the Mesoamerican region. We also suggest seven new synonymies resulting in 11 new combinations.

New Information: The following 25 new species of are described: , , , , , , , , , , , , , , , , , , , , , , , , and The following are proposed by Fleming & Wood as new generic synonyms of : Coquillett , Thompson , Curran , Townsend , Curran , , Townsend The following new combinations are proposed as a result of the new synonymies: (Curran, 1925) , (Giglio-Tos, 1893) , (Townsend, 1939) , (Curran, 1927) , (Townsend, 1931) , (Thompson, 1963) , (Curran, 1925) , (Thompson, 1963) , (Townsend, 1908) , (Curran, 1925) , (Thompson, 1963) , (Fabricius, 1805) Fabricius is synonymized under Fabricius, Fleming & Wood is proposed as a replacement name for Schiner.Additionally we provide redescriptions of two previously named species: the type species (van der Wulp) due to its being the type species, and (van der Wulp) due to its having been reared as an outcome of the inventory.