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 aureolus sp.nov. ( Figs 43–45 ) Diagnosis. Antenna flattened, scape widest at apex ( Fig. 43 ); pronotal collar with a weak carina along anterior margin ( Fig. 43 ); midlobe of mesoscutum with two pairs of setae ( Fig. 43 ); fore wing strongly infuscate with a hyaline band close to apical margin and with area below basal two-thirds of marginal vein hyaline ( Figs 44, 45 ); hind tarsus with T1–3 white, T4 pale brown ( Fig. 44 ); petiole as long as wide with strong sculpture dorsally; length of body female 1.1mm , male 1.2–1.4mm . Female holotype : length of body 1.1mm . Antenna dark brown. Frons dark brown with metallic tinges. Vertex metallic purple. Mesoscutum with midlobe golden and sidelobes metallic purple. Mesoscutellum golden with lateral and posterior margin metallic bluish-purple. Dorsellum with metallic blue tinges. Propodeum with golden and golden-green tinges. Coxae and femora dark brown; fore tibia whitish, mid and hind tibiae dark brown; tarsi with T1–3 white, T4 pale brown. Fore wing strongly infuscate with a hyaline band close to apical margin and with area below basal two-thirds of marginal vein hyaline; hind wing hyaline. Petiole dark brown. Gaster with Gt 1 golden medially and metallic purple laterally, remaining tergites dark brown with metallic tinges. Antenna flattened, scape widest at apex. Frons with strong reticulation; frontofacial suture Vshaped. Vertex with strong reticulation in anterior one-half, smooth in posterior one-half. Subtorular sutures present. Occipital margin rounded. Pronotal collar with a weak carina along anterior margin. Mesoscutum and mesoscutellum with strong reticulation; notauli distinct in anterior one-half; midlobe of mesoscutum with two pairs of setae. Dorsellum flat with weak sculpture. Propodeum with strong sculpture in posterior two-thirds and smooth in anterior one-third; callus with two setae. Fore wing speculum closed; with a stigmal hairline and with radial cell bare. Petiole as long as wide with strong sculpture dorsally. Gaster short ovate; Gt 1-2 smooth, remaining tergites with weak reticulation. Relative measurements: head length dorsal 13; head length frontal 18; head width 30; POL 6; OOL 3.5; lateral ocellus maximum width 2; eye length 13.5; malar space 6.5; mouth width 7.5; mesosoma length 37; mesosoma width 25; mesoscutellum length 15; mesoscutellum width 14; fore wing length 55; fore wing width 34; marginal vein length 29; postmarginal vein length 1.5; stigmal vein length 4.5; fore wing marginal fringe length 8.5; gaster length 37; gaster width 25. Male ( Fig. 45 ). Length of body 1.2–1.4mm . Fore tibia with basal one-half dark brown and apical one-half white, to predominantly dark brown. Propodeum dark brown non-metallic. Otherwise similar to female. Hosts . Unknown. Distribution. Ecuador , Peru . Material examined. Type material. Holotype ♀ “ ECUADOR : Pichin , 10km N. Guayllabamba , 26.ii.1983 , Masner & Sharkey” ( CNC ) . Paratypes 3♂ “ PERU : Ollantaytambo , 19.xii.1983 , L. Huggert ” ( MZLU ) . Etymology. From the Latin aureolus = golden, glittering, referring to the colour of thoracic dorsum.