The European species of Foersterella Dalla Torre (Hymenoptera: Tetracampidae), including the description of two new species Author Hansson, Christer text Zootaxa 2016 4137 4 561 568 journal article 10.11646/zootaxa.4137.4.8 ec459c7d-d70b-416d-aae6-54da0e6e9581 1175-5326 255283 9935AF06-E546-4E3A-829D-DCC930B3EC2F Foersterella fuscicornis sp. nov. Figs 4 , 10 Material . Holotype male labeled “ SWEDEN : Öland, Bostorpsvägen, 56°38′ 56.8N 16°35′ 25.5E , 25.vi.2014 , C. Hansson”, in MZLU . Paratypes ( 6♂ ): 1♂ “ SWEDEN : Öland, Bårby Borg, 56°30′ 09.0N 16°25′ 33.1E , 1.vii.2014 , C. Hansson” ( MZLU ); 2♂ “ SWEDEN : Öland, Karums Alvar, 56°46′ 28.1N 16°37′ 30.6E , 4.vii.2014 ” ( BMNH , MZLU ); 1♂ “ FRANCE : B du Rhone, Fonscolombe (3), 18.vii.1979 , M.W.R. de V. Graham” ( BMNH ); 1♂ from same locality as previous but collected 25.vii.1979 ( BMNH ); 1♂ “ FRANCE : (Ht Rhin), Wintzenheim, on Tanacetum vulgare, 27.vii.1974 , Remaudiere” ( BMNH ). Diagnosis . Male . Antenna ( Figs 4 , 10 ): flagellum completely dark; F1 1.5×, F2 1.3×, F3 1.2×, and F6 0.7× as long as wide; antennal clava (in widest part) 1.3× as wide as greatest width of pedicel; face with rather thin setation, as in F. angusticornis ( Fig. 5 ). Description (male holotype , a non-shrivelled specimen). Length: 1.2 mm . Colour. Scape yellowish-white, pedicel and flagellomeres dark brown. Head and mesosoma golden-green, gaster dark brown with golden-green tinges. Fore coxa yellowish white with base infuscate, mid coxa yellowishbrown with base infuscate, hind coxa dark brown with metallic tinges; tibiae pale yellowish-brown with bases more or less infuscate; tibiae pale yellowish-brown; tarsi with tarsomeres 1–3 yellowish-brown and tarsomere 4 pale brown. Wings hyaline. Head. Scape 2.0× as long as wide; ratios length/width of flagellomeres I/II/III/IV/V/VI: 1.5/1.3/1.2/1.0/0.8/0.7. Frons and vertex with very weak and superficial reticulation; occipital margin rounded without carina. Ratios width/height/length of head 1.9/1.0/1.5; height of eye/malar space/mouth opening 1.5/1.0/1.3; distances between posterior ocelli (POL)/between ocelli and eyes (OOL) 1.8/1.0. Mesosoma. Mesosoma 1.5× as long as wide. Pronotum medially 1.2× as long as midlobe of mesoscutum. Mesoscutum 0.7× as long as scutellum, with very weak and fine reticulation and short setae scattered over surface; midlobe with two long setae close to posterior margin; notauli complete and deep. Scutellum 0.9× as long as wide, with very weak and fine reticulation and two pair of setae attached close to lateral margin, the anterior pair about in the middle and posterior pair ⅔ from anterior margin of scutellum. Fore wing 2.6× as long as wide; submarginal vein with three setae on dorsal surface; speculum small and closed below; basal cell covered with setae; costal cell narrow, 14× as long as wide, with a complete row of 9 setae on ventral surface; ratios of length of marginal/ postmarginal/stigmal veins 5.3/3.3/1.0. Propodeum steeply sloping; median part with 6+6 short setae on either side of an imaginary median line and setae pointing towards the imaginary median line; propodeal callus with eight setae. Metasoma. Petiole very short and inconspicuous. Gaster ovate, 1.7× as long as wide. Ratio length of mesosoma/length of gaster 0.8. Variation . Minimal in the paratype material, the length varies from 0.9–1.1 mm ; in one Swedish specimen the mid coxa is dark brown, and the median part of the propodeum has 5+5 setae in another Swedish specimen and 8+8 setae in one French specimen. Female . Unknown. Host . Unknown, but based on records for other species in Foersterella it probably is an egg parasitoid of some species of Cassida ( Coleoptera : Chrysomelidae ). Distribution . France , Sweden . Etymology . Named after the completely dark antennal flagellum in the male.