Galeopsomyia opala Hansson sp.nov. (Figs 552, 553, 854) Diagnosis (female). Antenna with distinct constriction between C1 and C2, flagellum narrow (Fig. 854); genal carina present; mesoscutellum (Fig. 552) rugose throughout and with a complete median groove, submedian grooves with outer margin absent, straight and slightly diverging towards posterior part; dorsellum with median carina; propodeum (Fig. 552) with a mix of irregular carinae and strong reticulation, callus with three setae; gaster (Fig. 552) 2.2× as long as wide, medio-basal Gt1 with a sharp edge shaped like an inverted U (as in Fig. 24), tergites with strong reticulation. Female holotype: length of body 2.2mm (paratypes 1.8–2.1mm). Scape yellowish-brown, pedicel and flagellum dark brown. Head with frons black with metallic green and blue tinges, antennal scrobes black and clypeus dark brown; vertex black with metallic blue tinges. Thoracic dorsum metallic bluish-green. Legs with fore and mid coxae dark brown, hind coxa black with metallic tinges; trochanters yellowish-brown; femora dark brown to black with apical one-quarter yellowish-brown; tibiae yellowish-brown; T1–3 yellowish-brown, T4 pale brown. Petiole black. Gaster with Gt 1-2 metallic bluish-green, Gt 3-4 metallic bluish-green on sides, black with purplish tinges medially, Gt5-6 black with purplish tinges, Gt 7 black; gonoplac black. Antenna with distinct constriction between C1 and C2. Face below level of toruli with strong reticulation, clypeus smooth, frons rugose, antennal scrobes with weak reticulation; with genal carina. Vertex with strong reticulation outside ocellar triangle, with wrinkled sculpture inside ocellar triangle; with a carina between posterior ocelli in posterior part. Mesoscutum with strong reticulation, meshes isodiametric on sidelobes, elongate on midlobe; midlobe with a very weak median groove in posterior half, with nine scattered adnotaular setae. Mesoscutellum with strong rugosity; submedian grooves with outer margin absent, straight and slightly diverging towards posterior part; with a complete but weak median groove; with nine setae scattered over lateral parts. Dorsellum with strong sculpture, with median carina. Propodeum with a strong and relatively wide median carina that expands posteriorly; with a mix of irregular carinae and strong reticulation; callus with three setae. Fore and hind coxae with strong reticulation, mid coxa with weak reticulation. Fore wing with four setae on dorsal surface of submarginal vein; speculum closed; costal setal row unbroken. Petiole very short, just a narrow band. Gaster elongate; medio-basal Gt 1 with a sharp edge shaped like an inverted U; tergites with strong reticulation; longest cercal seta broken off. Relative measurements: head length, dorsal view 21; head length, frontal view 31; POL 7.6; OOL 6; lateral ocellus diameter 3.5; head width 42; mouth width 12; malar space 11.5; eye length 20; scape length 16; scape width 4; pedicel+flagellum length 52; pedicel length 6; pedicel width, dorsal view 3.8; F1 length 7.5; F1 width 4; F2 length 8.5; F2 width 4; F3 length 8.5; F3 width 4; clava length 19; clava width 4.3; C3 length 6; spicule length 2; mesosoma length 51; mesosoma width 36; midlobe of mesoscutum length 17; mesoscutellum length 19; mesoscutellum width 20; median part of mesoscutellum width (measured medially) 7; median part of mesoscutellum, width in anterior part 6.5; median part of mesoscutellum, width in posterior part 7; lateral part of mesoscutellum, width (measured medially) 4.5; dorsellum length 3; propodeum length 9.5; costal cell length 28; costal cell width (measured at widest part) 2.5; marginal vein length 23; stigmal vein length 9.5; gaster length 75; gaster width 34; Gt 2 length (measured medially) 8.5; Gt 4 length (measured medially) 9; Gt 7 length (measured medially) 9; Gt 7 width (measured at base) 11; longest cercal seta length nm; shortest cercal seta length nm. Male. Unknown. Hosts. Unknown. Distribution. Costa Rica. Material examined. Holotype ♀ COSTA RICA, Puntarenas, Estación Altamira, Sendero Los Gigantes, 9º02’N, 83º00’W, 1450m, 7.ii-5.iii.2002, C. Hansson & Parataxonomos (MZLU). Paratypes (4♀, MZLU, MZUCR, NHMUK): 3♀ with same label data as holotype; 1♀ from same locality as previous but collected 10.iii.2001.

Published as part of Hansson, Christer & Hanson, Paul E., 2023, EULOPHIDAE OF COSTA RICA (HYMENOPTERA: CHALCIDOIDEA), 5: The genus Galeopsomyia Girault, pp. 1-743 in Taxonomic Monographs on Neotropical Hymenoptera (Oxford, England) (Oxford, England) 3 (1) on pages 422-424, DOI: 10.5281/zenodo.8372024