A revision of European species of the genus Tetrastichus Haliday (Hymenoptera: Eulophidae) using integrative taxonomy Author Hansson, Christer The Natural History Museum, London, United Kingdom & Biological Museum (Entomology), Lund University, Lund, Sweden christerdennis@gmail.com Author Schmidt, Stefan https://orcid.org/0000-0001-5751-8706 SNSB-Zoologische Staatssammlung Muenchen, Munich, Germany schmidt.s@snsb.de text Biodiversity Data Journal 2020 2020-12-16 8 59177 59177 http://dx.doi.org/10.3897/BDJ.8.e59177 journal article http://dx.doi.org/10.3897/BDJ.8.e59177 1314-2828-8-e59177 AD70B3AB67634D2885F290988225C5C8 2BC7CCC36D765F1C87ACBE8025DFD848 Tetrastichus marcusgrahami sp. n. Description FEMALE holotype (Fig. 34 ). Body length 2.6 mm. Head. Width/length in dorsal view 2.4, width/length in frontal view 1.3, POL/OOL 1.3, head/mesosoma width 1.1, mouth width/malar space 1.9, malar space/eye height 0.8. Antenna. Scape length/eye height 1.0, pedicel+flagellum length/mesosoma width 1.1, length/width F1, F2, F3 1.8, 1.4, 1.2, clava length/width 2.8, lengths pedicel/F1 0.6, lengths F1/F2 1.2, F1/F3 1.3, lengths F1, F2, F3/clava 0.5, 0.5, 0.4, width F1/pedicel (dorsal view) 1.2, lengths antennal spicule/C3 0.2. Mesosoma. Length/width 1.5, mesoscutal mid-lobe length/width 1.0 (width measured in anterior part), mid-lobe with a weak median groove in median ⅓, with five adnotaular setae on each side, lengths mesoscutum/mesoscutellum (measured medially) 1.2, lengths dorsellum/propodeum 0.5, mesoscutellum length/width 1.1, length/width of enclosed space between submedian grooves 2.8, distance between SMG/distance between SMG and SLG 1.5, propodeum with strong reticulation in anterior 1/2 , smooth in posterior 1/2 , propodeal callus with five setae. Fore wing. Costal cell length/width 9.1, lengths costal cell/marginal vein 1.1, lengths marginal/stigmal veins 3.0. Gaster. Ovate, length/width 1.4, lengths gaster/mesosoma 1.1, Gt7 length/width 0.6, lengths longest cercal seta/next longest seta 1.3, longest cercal seta curved, ovipositor sheaths not reaching apex of Gt7. Colour. Body golden-green, scape golden-green, pedicel and flagellum dark brown, tegulae black with metallic tinges, wings hyaline, wing venation brown to fuscous, coxae and femora concolorous with body, trochanters blackish, tibiae yellowish-brown, tarsi dark brown. MALE. Unknown. Diagnosis Mandibles as in T. halidayi , i.e. mandibles very large with outer tooth falcate and separated by a wide gap from the two small inner teeth (as in Figs. 2a and 65d); mouth opening large, 1.9 x as wide as malar space. Differs from T. halidayi in having a shorter female gaster with ovipositor retracted and apex not reaching apical margin of gaster. Similar also to T. cyprus , from which it differs in antennal characters as indicated in the key. Etymology Named after collector of type specimen, Marcus William Robert de Vere Graham. Distribution United Kingdom. Notes The head of the holotype is detached and glued separately on a card and the right antennal flagellum is missing (deposited in NHM). Host Unknown. Material examined Holotype ♀ "ENGLAND: Lancashire, Freshfield (3) (Area I), 3.vi.1959", "M.W.R. de V. Graham coll., BMNH(E) 1995-489" (NHM).