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 pumilus sp.nov. ( Figs 147–151 ) Diagnosis. Antenna flattened, dark brown with F5 pale brown, male F4&5 not flattened, scape widest at apex ( Fig. 149 ); flagellomeres with long setae, longer in male ( Figs 147–151 ); head strongly transverse in frontal view with frontofacial suture straight ( Fig. 150 ); pronotal collar without a carina along anterior margin ( Fig. 147 ); midlobe of mesoscutum with two pairs of relatively long and strong setae ( Fig. 147 ); fore wing hyaline with a narrow infuscate band below stigmal vein reaching to hind margin ( Figs 148, 149 ); length of body female 0.7mm , male 0.6–0.7mm . A small, dark brown, non-metallic and predominantly smooth species. Female holotype : length of body 0.7mm . Antenna dark brown with F5 pale brown. Head, meso- and metasoma dark brown non metallic. Legs ±infuscate with hind coxa and hind femur darker. Fore wing hyaline with a narrow infuscate band below stigmal vein, band reaching hind margin; hind wing hyaline. Antenna flattened, flagellomeres with long setae. Frons and vertex with weak reticulation. Frontofacial suture straight. Subtorular sutures present. Occipital margin rounded. Pronotal collar without a carina along anterior margin. Mesoscutum smooth with anterior and lateral parts with weak reticulation; notauli missing; midlobe with two pairs of setae. Mesoscutellum convex and smooth. Dorsellum convex and smooth. Propodeum smooth, without median carina; callus with two setae. Fore wing speculum closed; without a stigmal hairline and with radial cell hairy. Petiole transverse and smooth. Gaster ovate; tergites smooth. Relative measurements: head length dorsal 9.5; head length frontal 11; head width 21.5; POL 4; OOL 3; lateral ocellus maximum width 1.5; eye length 7.5; malar space 3.5; mouth width 5.5; mesosoma length 21; mesosoma width 15; mesoscutellum length 8; mesoscutellum width 9; fore wing length 37; fore wing width 19; marginal vein length 20; postmarginal vein length 1; stigmal vein length 3; fore wing marginal fringe length 8.5; gaster length 25; gaster width 14. Male ( Figs 148, 149 ). Length of body 0.6–0.7mm . Setae on flagellomeres longer than in female; F4&5 long and narrow, not flattened. Otherwise as in female. Hosts . Unknown. Distribution. Costa Rica . Material examined. Type material. Holotype ♀ “ COSTA RICA : Puntarenas , San Vito , Las Cruces , 8º46’N , 82º57’W , 1300m , 15-16.ii.2006 , J.S. Noyes ” ( NHMUK ) . Paratypes : 3♂ “ COSTA RICA : Alajuela , P.N. Arenal , Send. Pilón, 10º27’N , 84º43’W , 26.ii.2003 , J.S. Noyes ” ( MZLU , NHMUK ) . Etymology. From the Latin pumilus = dwarfish, little, referring to the small size of this species.