Nine new species of Horismenus Walker (Hymenoptera: Eulophidae) in Brazil, with an emphasis on the fauna of one of the largest tropical forests on the planet, the Atlantic Forest Author Pikart, Tiago G. 0000-0001-7367-8339 Laboratório de Proteção Florestal, Departamento de Engenharia Florestal, Centro de Ciências Agroveterinárias, Universidade do Estado de Santa Catarina, 88520 - 000, Lages, Santa Catarina, Brazil tiago.pikart@udesc.br Author Schoeninger, Karine 0000-0001-9079-9570 Unidade Laboratorial de Referência em Controle Biológico, Instituto Biológico / APTA, 13101 - 680, Campinas, São Paulo, Brazil Author Costa, Valmir A. 0000-0003-0122-3567 Unidade Laboratorial de Referência em Controle Biológico, Instituto Biológico / APTA, 13101 - 680, Campinas, São Paulo, Brazil Author Hansson, Christer 0000-0002-9429-0197 Scientific Associate of the Biological Museum (Entomology), Lund University, Lund, Sweden, and of the Natural History Museum, London, U. K. Author Zanuncio, José C. 0000-0003-2026-281X Departamento de Entomologia, Universidade Federal de Viçosa, 36570 - 000, Viçosa, Minas Gerais, Brazil Author Serrão, José E. 0000-0002-0477-4252 Departamento de Biologia Geral, Universidade Federal de Viçosa, 36570 - 000, Viçosa, Minas Gerais, Brazil text Zootaxa 2024 2024-05-17 5453 1 33 62 http://dx.doi.org/10.11646/zootaxa.5453.1.2 journal article 10.11646/zootaxa.5453.1.2 1175-5326 11233551 5AE6BDB5-3725-4D55-B605-7E6042189C1C Horismenus saueri Pikart , Costa & Hansson, sp. nov. Figs 82–90 Type material. Holotype ♀ point mounted, with label “[ Campinas ], São Paulo , BRASIL , 17/8/1939 , HFG Sauer ”, “371.”, “ IB-CBE nº 00023” (deposited in MZUSP ) . Paratypes . 11♀ , with same label data as holotype, but with unique-identifier , IB-CBE nº 00021, 00022, 00024 e 02107–02114 ( 5♀ MZSP , 4♀ BMNH , 2♀ IB-CBE ) . FIGURES 82–84. Horismenus saueri sp. nov. , females, paratypes: 82 , habitus, lateral view; 83 , mesosoma, dorsal view; 84 , head, frontal view, joining of the antennal scrobes below the frontofacial sulcus indicated by arrow. Scale bar: 82 = 500 μm; 83–84 = 100 μm. Type condition. Holotype and paratypes in good condition, except for one paratype with left antenna missing the last flagellomere. Diagnosis. Antennal scrobes joining below frontofacial sulcus ( Fig. 84 ); malar sulcus present; mesoscutum with strong raised reticulation ( Fig. 89 ); mesoscutellum smooth and shiny ( Fig. 89 ); mesoscutum metallic bluishgreen with golden luster, mesoscutellum black shiny ( Fig. 83 ); propodeal callus with 2 setae; femora and tibiae yellowish brown ( Fig. 82 ); eyes large and frons narrow ( Fig. 85 ), DE/DO= 2.3; hind tibial spur short, LS/LT= 0.2; gaster conspicuously pilose ( Fig.90 ). Similar to Horismenus argus Hansson , but posterior ocellus closer to occipital margin than to eye, malar sulcus present, midlobe of mesoscutum with completely raised reticulation ( Fig. 89 ) and hind tibial spur shorter. Description. Female. Length of body 2.5–2.7 mm . Color. Scape, pedicel and flagellum metallic bluish green to metallic dark blue ( Fig. 84 ). Lower frons black shiny, malar space metallic golden green, remaining parts of frons blue to metallic bluish green ( Fig. 84 ); vertex metallic golden green. Mesoscutum metallic bluish green with golden tinges ( Fig. 83 ). Mesoscutellum black shiny, lateral and posterior margins with dark bluish green to golden green tinges ( Fig. 83 ). Propodeum metallic bluish green with golden tinges, some reticulate parts black shiny ( Fig. 83 ). Coxae metallic dark blue; femora, tibiae and tarsi yellowish brown to pale brown ( Fig. 82 ). Wings hyaline. First gastral tergite with anterior one-third to half metallic bluish green with golden tinges, remainder black; remaining tergites black. FIGURES 85–90. Horismenus saueri sp. nov. , females, paratypes: 85 , head, frontal view; 86 , antenna, lateral view; 87 , vertex; 88 , propodeum with wide anterolateral foveae and laterally rounded indicated by arrow; 89 , mesosoma, dorsal view; 90 , gaster, dorsal view, reticulate area on the first tergite indicated by black arrows. Scale bar: 85 , 87 , 89–90 = 100 μm; 86 , 88 = 50 μm. Head. Antennae as in Fig. 86 . Lower frons with strong raised reticulation, remaining parts of frons smooth and shiny to weakly reticulate ( Fig. 85 ); frontofacial sulcus V-shaped, incomplete, and not reaching eyes; antennal scrobes joining below frontofacial sulcus ( Fig. 84 ). Malar sulcus present. Vertex ( Fig. 87 ) with raised reticulation laterally, area in front of anterior ocellus and within ocellar triangle with engraved reticulation; median groove present posteriorly. Occipital margin slightly rounded. Mesosoma. Mesoscutum ( Fig. 89 ) with strong raised reticulation; notauli distinct. Mesoscutellum ( Fig. 89 ) smooth and shiny; lateral mesh-rows almost reaching the mesoscutellar foveae. Metascutellum convex, smooth and shiny, with two foveae anteriorly. Propodeum ( Fig. 88 ), including anterolateral foveae, smooth and shiny, median carina weakly reticulate; submedian grooves, nucha and plicae with strong raised reticulation; anterolateral foveae wide with lateral margins rounded ( Fig. 88 ); propodeal callus with 2 setae. Coxae weakly reticulate. Fore wing with speculum closed posteriorly, with 21–27 admarginal setae, costal cell bare. Metasoma. Gaster pilose ( Fig. 90 ), with first tergite smooth and shiny with a large area in the posterior half with reticulation to reticulate laterally and punctuated medially. Ratios. DE/DO 2.3; WH/DE 4.4; HE/MS/WM 3.6/1.0/1.9; POL/OOL/POO 6.4/1.5/1.0; WH/WT 1.1; LW/LM/ HW 1.8/1.2/1.0; PM/ST 1.3; LC/WC 4.1; WG/WC 0.6; LS/LT 0.2; LP/WP not measurable; MM/LG 0.8. Male. Unknown. Etymology. The specific name is in honor of the collector of the type-material of this species, Henrique F. G. Sauer ( in memoriam ). Distribution. Brazil (Campinas, São Paulo State ). Hosts. Unknown. Species identification. Using the key in Hansson (2009) , females run to subkey F, couplet 28, first alternative, where this species can be distinguished from H. argus as mentioned above under diagnosis.