Eulophidae Of Costa Rica (Hymenoptera: Chalcidoidea), 4 The Genus Closterocerus Westwood S. Str. Author Hansson, Christer text Taxonomic Monographs on Neotropical Hymenoptera 2022 Oxford, England 2022-04-28 1 1 1 137 http://dx.doi.org/10.5281/zenodo.6464278 journal article 10.5281/zenodo.6464279 978-1-7397467-0-4 2754-9844 FE033A11-ACCB-4C6D-B185-63420F8CA79B Closterocerus amaurus sp.nov. ( Figs 22–24 ) Diagnosis. Antenna flattened, scape widest at apex ( Fig. 23 ); ocelli very small, ratio POL/posterior ocellus width 4.7 ( Fig. 24 ); pronotal collar without a carina along anterior margin ( Figs 22, 23 ); midlobe of mesoscutum without setae; fore wing infuscate with a hyaline band close to apical margin and with area just below marginal vein hyaline ( Fig. 23 ); length of body female 1.2mm . A dark species (dark brown to black) with weak metallic tinges on thoracic dorsum. Female holotype : length of body 1.2mm . Antenna dark brown to black. Head black. Mesoscutum, mesoscutellum, dorsellum and propodeum black with metallic purple tinges. Coxae, femora and tibiae black; fore tarsus dark brown; mid and hind tarsi with T1–3 white, T4 black. Fore wing infuscate with a hyaline band close to apical margin and with area just below marginal vein hyaline; hind wing hyaline. Petiole not visible in type specimen. Gaster dark brown. Antenna flattened, scape widest at apex. Frons and vertex with strong reticulation; ocelli small. Frontofacial suture V-shaped. Subtorular sutures present. Occipital margin rounded. Pronotal collar without a carina along anterior margin. Mesoscutum with strong reticulation; notauli indistinct; midlobe without setae. Mesoscutellum ±flat, with strong reticulation. Dorsellum convex with weak reticulation. Propodeum smooth, without median carina; callus with two setae. Fore wing speculum closed; with a stigmal hairline and with radial cell bare; with hyaline part below marginal vein bare. Petiole hidden on type specimen. Gaster ovate-elongate; tergites with weak reticulation. Relative measurements: head length dorsal 14; head length frontal 19; head width 29; POL 7; OOL 2.5; lateral ocellus maximum width 1.5; eye length 11.5; malar space 7; mouth width 6; mesosoma length 33; mesosoma width 25; mesoscutellum length 12.5; mesoscutellum width 14.5; fore wing length 57; fore wing width 32; marginal vein length 31; postmarginal vein length 1.5; stigmal vein length 5; fore wing marginal fringe length 7; gaster length 42; gaster width 26. Male. Unknown. Hosts . Unknown. Distribution. Costa Rica . Material examined. Type material. Holotype ♀ “ COSTA RICA : Cartago , Cerro de la Muerte , Villa Mills , 3000m , 9°34´N 83°44´W , i-v.1991, P. Hanson ” ( NHMUK ). Etymology. From the Greek amauros = dark, referring to the dark appearance of this species.