Closterocerus aureopurpureus sp.nov. (Figs 46–48) Diagnosis. Antenna flattened, scape widest at apex (Fig. 48); pronotal collar with a carina along anterior margin (Fig. 46); midlobe of mesoscutum with three pairs of setae (Fig. 46); midlobe of mesoscutum and mesoscutellum with median part dark (golden-purple), contrasting against lateral parts (Fig. 46); fore wing hyaline with three infuscate parts: along apical margin, below stigmal vein, and below marginal vein (Figs 46–48); hind tarsus with T1 and T4 dark brown, T2–3 white (Fig. 48); length of body female 1.3–1.8mm, male 1.1mm. Female holotype: length of body 1.8mm. Antenna dark brown to black. Head with frons golden-green; vertex metallic purple. Mesoscutum with midlobe with median part golden-purple, lateral parts and sidelobes metallic bluish-purple. Mesoscutellum with median part golden-purple and lateral parts metallic bluish-purple. Dorsellum metallic purple. Propodeum with median part golden and lateral parts black. Coxae and femora black with metallic tinges; fore tibia pale brown with base dark brown, mid and hind tibiae black with metallic tinges, fore tarsus brown, mid and hind tarsi with T1 and T4 black, T2–3 white. Fore wing hyaline with three infuscate parts: along apical margin, below stigmal vein, and below marginal vein, hind wing hyaline. Petiole hidden in type specimen (dark brown in paratype). Gaster with Gt 1 and Gt 6 metallic purple, remaining tergites golden. Antenna flattened, scape widest at apex. Frons and vertex with strong reticulation. Frontofacial suture V-shaped. Subtorular sutures present. Occipital margin rounded. Pronotal collar with a carina along anterior margin. Mesoscutum with strong reticulation; notauli distinct in anterior ¾; midlobe with three pairs of setae. Mesoscutellum convex, with strong reticulation. Dorsellum convex and smooth. Propodeum with weak reticulation, without median carina; callus with two setae. Fore wing speculum closed; with a stigmal hairline and with radial cell bare. Petiole hidden in type specimen (very short, just a narrow band in paratype). Gaster ovate; tergites mainly smooth, partly with weak reticulation. Relative measurements: head length dorsal 20; head length frontal 27; head width 43; POL 8; OOL 4; lateral ocellus maximum width 3; eye length 21; malar space 6; mouth width 11; mesosoma length 57; mesosoma width 39; mesoscutellum length 22.5; mesoscutellum width 21.5; fore wing length 88; fore wing width 56; marginal vein length 51; postmarginal vein length 2.5; stigmal vein length 8.5; fore wing marginal fringe length 5; gaster length 64; gaster width 36. Variation in paratype material. Length of body: 1.3mm. Paratype similar to holotype. Male (Fig. 47). Length of body: 1.1mm. Vertex metallic bluish-purple in anterior one-half, golden in posterior one-half. Mesoscutum with midlobe golden-red, sidelobes metallic bluish-purple. Mesoscutellum golden-red with sides golden-green. Dorsellum metallic purple. Propodeum golden-green medially, metallic purple on lateral parts. Sculpture as in female. Hosts. Unknown. Distribution. Costa Rica, Mexico. Material examined. Type material. Holotype ♀ “ COSTA RICA: Puntarenas, Buenos Aires, Estación Altamira, Sendero Cerro Biolley, 1766m, 13.ii-15.iii.2001, D. Rubí, MT, LS 572200/332400, #62094” (NHMUK). Paratypes: 1♀ 1♂ “ MEXICO, Michoacan, 2mi. S Carapan, 6.vii.1986, J.B. Woolley, 85/031” (TAMU). Etymology. From the Latin aurum = gold, and purpureus = purple, referring to the colour of dorsum.

Published as part of Hansson, Christer, 2022, Eulophidae Of Costa Rica (Hymenoptera: Chalcidoidea), 4 The Genus Closterocerus Westwood S. Str., pp. 1-137 in Taxonomic Monographs on Neotropical Hymenoptera (Oxford, England) (Oxford, England) 1 (1) on pages 26-27, DOI: 10.5281/zenodo.6464279