Mesochorus

Key to the Palaearctic subgenera of Mesochorus View in CoL View at ENA

1 Subantennal transverse carina dipped medially. Dorsal end of epicnemial carina usually not reaching frontal margin of mesopleuron. Vein 1cu-a of fore wing antefurcal, interstitial or moderately postfurcal (usually less than 0.5× its length). Postnervulus usually intercepted in basal half. Mesosoma not depressed (<1.8× as long as high). Postpetiole often smooth or with reduced sculpture. .............................................................. ......................................................................Subgenus Mesochorus GRAVENHORST, 1829

- Subantennal transverse carina straight medially. Dorsal end of epicnemial carina usually reaching frontal margin of mesopleuron. Vein 1cu-a of fore wing usually strongly postfurcal (often>0.5× its length). Postnervulus often intercepted in its middle or its apical half. Postpetiole often with longitudinal striae.................................................2

2 Apex of propodeum of both sexes not reaching behind midlength of hind coxa. Ovipositor sheath usually slender, at least 4.5× as long as wide, often much longer. Mesosoma sometimes ± depressed (>1.8× as long as high). Postpetiole usually ± longitudinally striate...............................................Subgenus Stictopisthus THOMSON, 1886

- Apex of propodeum elongate, reaching behind basal 0.7 of hind coxa. Ovipositor sheath very stout, not more than 4.0× as long as wide. Mesosoma not depressed. Postpetiole often ± smooth. ...................................... Subgenus Plectochorus UCHIDA, 1933 View in CoL