Trechnites, Thomson, 1876

Noyes, John Stuart, 2023, 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), Taxonomic Monographs on Neotropical Hymenoptera (Oxford, England) 2 (11), pp. 1-921 : 568-569

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)