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 arenalensis sp.nov. ( Figs 156, 157 , 163 ) Diagnosis. Antenna flattened, scape widest at apex, all flagellomeres distinctly separated ( Figs 157 , 163 ); upper border of frons distinct ( Fig. 157 ); pronotal collar with a carina along anterior margin ( Fig. 156 ); midlobe of mesoscutum without setae ( Fig. 156 ); petiole as long as wide with strong sculpture on dorsal surface; hind tarsus with T1 and T4 dark brown, T2–3 white ( Fig. 163 ); fore wing infuscate with basal one-third and a subapical band hyaline, speculum open below ( Figs 156 , 163 ); length of body female 1.1–1.6mm . Similar to C. hirsutus but with only two setae on propodeal callus, mesoscutellum with weaker reticulation, and hind tarsus shorter, 0.63× as long as hind tibia. Female holotype : length of body 1.4mm . Antenna dark brown to black. Frons below frontofacial suture golden-green, above suture black with metallic tinges. Vertex metallic purple. Mesoscutum with midlobe golden with anterolateral parts metallic bluish-purple, sidelobes metallic bluish-purple. Mesoscutellum golden with lateral and posterior margins metallic bluish-purple. Dorsellum metallic bluish-purple. Propodeum black. Coxae, femora, mid and hind tibiae black with metallic tinges; fore tibia and tarsus infuscate, mid tarsus with T1–3 white and T4 infuscate, hind tarsus with T1 and T4 black, T2–3 white. Fore wing infuscate with basal one-third and a band close to apical margin hyaline, hind wing hyaline. Petiole black. Gaster with Gt 1 metallic bluish-purple, remaining tergites dark brown with metallic tinges. Antenna flattened, scape widest at apex. Frons with strong reticulation; frontofacial suture Vshaped; upper border of frons distinct. Subtorular sutures present but difficult to see because they are short and dark. Vertex with strong reticulation. Occipital margin with a carina behind ocellar triangle, rounded laterally. Pronotal collar with a carina along anterior margin. Mesoscutum with strong reticulation; notauli distinct throughout; midlobe without setae. Mesoscutellum convex, with weak reticulation. Dorsellum convex and smooth. Propodeum with weak reticulation, partly smooth, with a median carina; callus with two setae. Fore wing speculum open below, with hyaline part below marginal vein bare; with a stigmal hairline and with radial cell bare. Petiole as long as wide, dorsal surface with strong sculpture. Gaster short-ovate, almost circular; Gt 1-2 smooth, remaining tergites with strong reticulation. Relative measurements: head length dorsal 19; head length frontal 21.5; head width 38; POL 6.5; OOL 4; lateral ocellus maximum width 3; eye length 19.5; malar space 5; mouth width 10.5; mesosoma length 46; mesosoma width 33; mesoscutellum length 18.5; mesoscutellum width 19; fore wing length 70; fore wing width 41; marginal vein length 40; postmarginal vein length 2.5; stigmal vein length 5.5; fore wing marginal fringe length 5; gaster length 44; gaster width 33.5. Variation in paratype material. Length of body: 1.1–1.6mm . Vertex metallic purple, or metallic purple with posterior one-half metallic blue. Midlobe of mesoscutum golden-red or golden with anterolateral parts metallic bluish-purple. Mesoscutellum golden-red or golden with lateral and posterior margins metallic bluish-purple. Gt 1 metallic bluish-green or bluish-purple. Male. Unknown. Hosts . Unknown. Distribution. Costa Rica . Material examined. Type material. Holotype ♀ “ COSTA RICA : Alajuela , P.N.Arenal , 10˚28’N, 84˚45’W, 617m , 21-28.ii.2005 , C. Hansson ” ( MZLU ) . Paratypes ( 6♀ , MZLU , MZUCR , NHMUK ) : 5♀ with same label data as holotype ; 1♀ “ COSTA RICA : Alajuela , P.N. Arenal , La Peninsula , 10˚27’N, 84˚45’W, 600m , 25.ii.2003 , J.S. Noyes ” . Etymology. From the type locality and the Latin suffix -ensis = place, locality.