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 Trechnites (Females and males) 1. Sculpture of mesoscutum and scutellum (Fig. 1481) contrasting and conspicuously coarser on scutellum; notaular lines (often only visible on slide-mounted material) nearly meeting medially and reaching, or very nearly reaching, posterior margin of mesoscutum ..................................................................................................... 2 - Sculpture of mesoscutum and scutellum (Fig. 1489, 1492, 1508) finely reticulate and of similar depth; notaular lines (often only visible on slide-mounted material) clearly separate, reaching at most a little over half-way across mesoscutum .................. 3 2 (1) Both mesoscutum and scutellum with imbricate-reticulate to polygonally reticulate sculpture, but that on mesoscutum composed of cells that are 2-4 times as large as those on scutellum, sculpture on scutellum coarser and strongly contrasting with that on mesoscutum; hind tibia and tarsus dark brown ........................................... .......................................................................... merops Noyes & Hanson (p. 569) - Mesoscutum (Fig. 1481) with transversely elongate imbricate-reticulate to striate-reticulate sculpture constrasting with longitudinally elongate polygonally reticulate to striate-reticulate sculpture on scutellum; hind tibia dark brown with apical half to one-third pale orange; hind tarsus yellow ...................... thelxines sp.nov. (p. 570)