The genus Eriastichus La Salle (Hymenoptera, Eulophidae, Tetrastichinae) in the Neotropical region, introducing 48 new species Author Hansson, Christer Scientific Associate Biological Museum (Entomology), Lund University, Soelvegatan 37, SE- 22362 Lund, Sweden & Natural History Museum, Life Sciences, Cromwell Road, London, UK christer.hansson@biol.lu.se text ZooKeys 2021 2021-02-22 1019 35 91 http://dx.doi.org/10.3897/zookeys.1019.60364 journal article http://dx.doi.org/10.3897/zookeys.1019.60364 1313-2970-1019-35 EE1BAF875BD74E189DF929E2C9CC7DAC 8D799427736453288CA3E1DB9933AAC6 Eriastichus oasis sp. nov. Figure 42 Type locality. Costa Rica, Heredia, Estacion Biologica La Selva, 75 m, 10°26'N , 84°01'W , 22-24.ii.2012, J.S. Noyes leg. Type specimen. Holotype male dried and glued to a paper card. Original labels: "COSTA RICA, Heredia, E.B. La Selva, 75 m, 10°26'N , 84°01'W , 22-24.ii.2012, J.S. Noyes, NHM (Ent) 2012-91", "HOLOTYPE Eriastichus oasis Hansson" [red printed label], (NHMUK014431058). Additional type material. Paratype 1♂ "Costa Rica, Cartago, Humo, El Copal, 9°47'N , 83°45'W , 1050-1250 m, 29.ii-6.iii.2008, C. Hansson" (MZLU:7043.2). Diagnosis (male). Head dark brown, scape yellowish brown, pedicel pale brown, flagellum brown; ventral plaque on scape ca. 0.5 x as long as scape (Fig. 42 ), antenna with dorsobasal setae on F1 0.5 x as long as F1; gaster with lateral tufts of pale and flattened setae on Gt6. Description (male holotype NHMUK014431058). Length of body 1.3 mm (paratype 1.4 mm). Head dark brown, scape yellowish brown, pedicel pale brown, flagellum brown, ventral plaque dark brown. Mesoscutum and mesoscutellum black with metallic tinges, dorsellum pale brown, propodeum dark brown. Legs yellowish brown, hind coxa with base dark brown. Gaster dark brown. Head . Length/width in frontal view 0.8; width/length in dorsal view 2.3; POL/OOL 2.0; WM/MS 1.5; MS/HE 0.5; HE/head length in frontal view 0.6; widths head/mesoscutum 1.2. Antenna . Pedicel + flagellum length/mesoscutum width 2.1; pedicel + flagellum length/head width 1.9; lengths scape/ventral plaque 2.2; ventral plaque located below the middle of scape; scape length/width 3.1; lengths scape/head (dorsal view) 0.5; scape length/HE 0.8; length/width F1, F2, F3, F4, clava: 3.3, 3.3, 3.3, 3.0, 8.5; length dorsobasal setae on F1/length F1 0.5. Mesosoma . Length/width 1.5; mesoscutum length/width 0.5; mesoscutellum length/width 0.6; widths SMG/SLG 0.9; enclosed space between SMG length/width 2.0; lengths mesoscutum/mesoscutellum 1.2; lengths mesoscutellum/dorsellum 2.3; lengths mesosoma/gaster 0.7. Wings . CC length/width 19.0; lengths CC/MV 1.2; lengths MV/ST 2.1; lengths MV/PM 4.1; lengths PM/ST 0.5; submarginal vein with seven setae on dorsal surface (six setae in paratype). Gaster . With lateral tufts of pale and flattened setae on Gt6.