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 platycerus sp.nov. ( Figs 135 , 141, 142 , 214 , 225 , 235 ) Diagnosis. Antenna flattened, scape widest at apex ( Figs 142 , 225 ); upper frons with an edge separating it from vertex ( Fig. 235 ); pronotal collar with a carina along anterior margin ( Fig. 141 ); mesoscutum and mesoscutellum with very weak reticulation and shiny ( Fig. 141 ); midlobe of mesoscutum without setae ( Fig. 141 ); fore wing infuscate with basal one-half and two subapical spots hyaline, speculum open below ( Figs 142 , 214 ); hind tarsus with T1 infuscate, T2–4 white ( Fig. 142 ); petiole as long as wide; gaster circular ( Fig. 141 ); length of body female 1.4–1.7mm , male 1.1mm . Female holotype : length of body 1.6mm . Antenna dark brown to black. Frons golden-green. Vertex metallic bluish-purple. Mesoscutum metallic bluish-green with posterior one-half of midlobe golden-red. Mesoscutellum metallic blue with anteromedian one-half golden-red. Dorsellum metallic bluish-purple. Propodeum metallic purple. Coxae, femora and hind tibia dark brown; fore and mid tibiae infuscate; fore tarsus infuscate, mid tarsus white, hind tarsus with T1 infuscate, T2–4 white. Fore wing infuscate with basal one-half and two spots close to apical margin hyaline; hind wing hyaline. Petiole black. Gaster with Gt 1-2 metallic bluish-purple, remaining tergites dark brown. Antenna flattened, scape widest at apex. Frons with strong reticulation; frontofacial suture Vshaped; part above suture with distinct margin separating it from vertex. Vertex with strong reticulation in anterior one-half, posterior one-half with very weak reticulation, partly smooth. Subtorular sutures missing. Occipital margin with an edge behind ocellar triangle. Pronotal collar with a carina along anterior margin. Mesoscutum and mesoscutellum with very weak reticulation and shiny; notauli distinct in anterior one-half; midlobe of mesoscutum without setae. Dorsellum convex and smooth. Propodeum with a median carina in posterior two-thirds, otherwise smooth; callus with two setae. Fore wing speculum open below; with a stigmal hairline and with radial cell bare. Petiole as long as wide, with strong sculpture on dorsal surface. Gaster circular. Relative measurements: head length dorsal 21; head length frontal 24; head width 40; POL 6; OOL 4,4; lateral ocellus maximum width 3; eye length 19.5; malar space 6.5; mouth width 11; mesosoma length 52; mesosoma width 34; mesoscutellum length 20; mesoscutellum width 20; fore wing length 80; fore wing width 42; marginal vein length 50; postmarginal vein length 2; stigmal vein length 5; fore wing marginal fringe length 6; gaster length 47; gaster width 40. Variation in paratype material. Length of body: 1.4–1.7mm . Vertex metallic bluish-purple, golden-green, or with anterior one-half metallic purple and posterior one-half metallic bluish-green. Male ( Fig. 135 ). Length of body 1.1mm . Entire vertex with very weak reticulation and metallic purple. Otherwise as in female. Hosts . Unknown. Distribution. Costa Rica . Material examined. Type material. Holotype ♀ “ COSTA RICA : Alajuela , Peñas Blancas , 700m , 18.viii.1986 , L. Masner ” ( CNC ) . Paratypes ( 2♀ 1♂ , MZLU . NHMUK ) : 1♂ “ COSTA RICA : Alajuela , P.N. Arenal , La Peninsula, 10˚27’N, 84˚45’W, 600m , 25.ii.2003 , J.S. Noyes ” ; 1♀ “ COSTA RICA : Alajuela , P.N. Arenal , 10˚28’N, 84˚45’W, 617m , 21-28.ii.2005 , C. Hansson ” ; 1♀ “ COSTA RICA : Alajuela , San Carlos , Sendero Pilón , 650m , 6-14.xi.2000 , G. Carballo , LN 458050_269200, #60086” . Etymology. From the Greek platys = broad, flat and keras = horn, antenna, referring to the flattened antenna.