Revision of the species of Lytopylus from Area de Conservación Guanacaste, northwestern Costa Rica (Hymenoptera, Braconidae, Agathidinae).

Thirty two new species of Lytopylus (Agathidinae) are described with image plates for each species: Lytopylus alejandromasisi sp. n. , Lytopylus alfredomainieri sp. n. , Lytopylus anamariamongeae sp. n. , Lytopylus angelagonzalezae sp. n. , Lytopylus cesarmorai sp. n. , Lytopylus eddysanchezi sp. n. , Lytopylus eliethcantillanoae sp. n. , Lytopylus ericchapmani sp. n. , Lytopylus gahyunae sp. n. , Lytopylus gisukae sp. n. , Lytopylus guillermopereirai sp. n. , Lytopylus gustavoindunii sp. n. , Lytopylus hartmanguidoi sp. n. , Lytopylus hernanbravoi sp. n. , Lytopylus hokwoni sp. n. , Lytopylus ivanniasandovalae sp. n. , Lytopylus johanvalerioi sp. n. , Lytopylus josecortesi sp. n. , Lytopylus luisgaritai sp. n. , Lytopylus mariamartachavarriae sp. n. , Lytopylus miguelviquezi sp. n. , Lytopylus motohasegawai sp. n. , Lytopylus okchunae sp. n. , Lytopylus pablocobbi sp. n. , Lytopylus robertofernandezi sp. n. , Lytopylus rogerblancoi sp. n. , Lytopylus salvadorlopezi sp. n. , Lytopylus sangyeoni sp. n. , Lytopylus sarahmeierottoae sp. n. , Lytopylus sergiobermudezi sp. n. , Lytopylus sigifredomarini sp. n. , and Lytopylus youngcheae sp. n. A dichotomous key and a link to an electronic, interactive key are included. All specimens were reared from Lepidoptera larvae collected in Area de Conservación Guanacaste (ACG) and all are associated with ecological information including host caterpillar, collection date, eclosion date, caterpillar food plant, and locality. Neighbor-joining and maximum likelihood analyses of the barcode region of the mitochondrial cytochrome c oxidase subunit I gene (COI DNA barcode) were conducted to aid in species delimitation.