ENCYRTIDAE OF COSTA RICA (HYMENOPTERA: CHALCIDOIDEA), 4 Subfamily Encyrtinae: tribes Arrhenophagini, Habrolepidini, Cerapterocerini, Cheiloneurini, Trechnitini, Cercobelini, Polaszekiini, Protyndarichoidini, Gahaniellini and Syrphophagini (part), mainly primary parasitoids and hyperparasitoids of Coccoidea and Psylloidea (Hemiptera) Author Noyes, John Stuart text Taxonomic Monographs on Neotropical Hymenoptera 2023 Oxford, England 2023-06-30 2 11 5228 5239 http://dx.doi.org/10.5281/zenodo.8074943 journal article 10.5281/zenodo.8074943 2754-9844 8074943 BCAD06E8-0AFE-46ED-B7FA-930983CD44C4 Key to Costa Rican species of Arrhenophagus (Females) 1. Head in facial view ( Fig. 10 ) clearly higher than broad, with clypeal margin strongly emarginate at base of each mandible; truncate surface of clava ( Fig. 9 ) less than 0.6X as long as ventral surface of clava ............. chionaspidis Aurivillius (p. 29) - Head in facial view as broad as high ( Fig. 11 ), with clypeal margin hardly emarginate at base of each mandible; truncate surface of clava ( Fig. 12 ) at least 0.8X as long as ventral surface of clava .................................................. albitibiae Girault (p. 30)