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 triquetrus sp.nov. ( Figs 170 , 175–177 , 216 , 226 ) Diagnosis. Antenna flattened, scape widest at apex ( Figs 177 , 226 ); frons with upper border distinct ( Fig. 177 ); ocelli small, ratio POL/posterior ocellus width = 3.2 ( Fig. 175 ); pronotal collar without a carina along anterior margin ( Figs 170 , 175 ); midlobe of mesoscutum with two pairs of setae ( Figs 170 , 175 ); fore wing triangular and infuscate with two hyaline areas, one L-shaped spot below marginal vein and one band close to apical margin ( Figs 175 , 216 ); hind tarsus with T1–3 white, T4 dark brown ( Fig. 176 ); length of body both sexes 1.1mm . Female holotype : length of body 1.1mm . Antenna dark brown. Frons golden-green. Vertex metallic bluish-green. Mesoscutum, mesoscutellum, dorsellum and propodeum metallic bluish-purple. Coxae, femora, mid and hind tibiae dark brown; fore tibia white with basal one-third dark; all tarsi with T1–3 white and T4 dark brown. Fore wing triangular and infuscate with two hyaline areas, one L-shaped spot below marginal vein and one band close to apical margin; hind wing hyaline. Petiole dark brown. Gaster with Gt 1-3 dark brown with lateral parts metallic purplish; remaining tergites dark brown with metallic tinges. Antenna flattened, scape widest at apex. Frons with weak reticulation; frontofacial suture V-shaped; upper border distinct. Vertex with strong reticulation; ocelli small. Subtorular sutures present. Occipital margin rounded. Pronotal collar without a carina along anterior margin. Mesoscutum and mesoscutellum with weak reticulation, meshes small and slightly transverse; notauli narrow and complete; midlobe of mesoscutum with two pairs of setae. Dorsellum convex and smooth. Propodeum reticulate with median part smooth, without median carina; callus with two setae. Fore wing triangular; speculum closed; with a stigmal hairline and with radial cell bare. Petiole very short, just a narrow band. Gaster oval-shaped; tergites with very weak reticulation. Relative measurements: head length dorsal 15; head length frontal 18; head width 28; POL 5.5; OOL 3; lateral ocellus maximum width 1,7; eye length 13.5; malar space 5; mouth width 7; mesosoma length 32; mesosoma width 21.5; mesoscutellum length 13.5; mesoscutellum width 13.5; fore wing length 46; fore wing width 27.5; marginal vein length 28; postmarginal vein length 1.5; stigmal vein length 3.5; fore wing marginal fringe length 5; gaster length 40; gaster width 26. Male. Length of body: 1.1mm . Frons golden-purple. Mesoscutum with sidelobes golden-purple, midlobe of mesoscutum and mesoscutellum golden-red with sides metallic bluish-green, dorsellum and propodeum metallic bluish-green. Otherwise as in female. Hosts . Unknown. Distribution. Mexico . Material examined. Type material. Holotype ♀ “ MEXICO : Oaxaca , 10mi E Totolapan , 20.vii.1987 , 4000’ [ 1219m ], J.B. Woolley , 87/052” ( TAMU ) . Paratype : 1♂ with same label data as holotype ( TAMU ) . Etymology. From the Latin triquetrus = triangular, referring to the triangular fore wing.