First record of the genus Microstenus Szépligeti (Hymenoptera: Ichneumonidae Cryptinae) from China, with description of one new species and a key to world species Author Li, Tao 0000-0001-6758-3472 General Station of Forest and Grassland Pest Management, National Forestry and Grassland Administration, Shenyang, Liaoning, 110034, P. R. China & litao 200105 @ 163. com; ichlitao @ 163. com; https: // orcid. org / 0000 - 0001 - 6758 - 3472 Author Sun, Shu-Ping Author Sheng, Mao-Ling General Station of Forest and Grassland Pest Management, National Forestry and Grassland Administration, Shenyang, Liaoning, 110034, P. R. China text Zootaxa 2020 2020-08-28 4838 4 594 600 journal article 8550 10.11646/zootaxa.4838.4.10 4b187e4d-a8e1-4c62-be7f-8759989f9590 1175-5326 4405353 A48C0045-C788-4C2E-911E-1B78AA6CD51B Key to world species of Microstenus (modified from Gupta & Gupta 1983 ) 1 Mesopleuron and metapleuron black...................................................................... 2 - Mesopleuron and metapleuron yellowish brown............................................................. 3 2 Pronotum groove and anterior margin of speculum with short ridges; ovipositor sheath about 1.0 × as long as hind tibia; metapleuron rugulose; tergite I (median portion black) yellow.................................... M . falsosus (Tosquinet) - Pronotum groove smooth; anterior margin of speculum without ridges; ovipositor sheath about 1.1 × as long as hind tibia; metapleuron without rugulose; tergite I (apical portion yellow) black..................... M . mysorensis Gupta & Gupta 3 Malar space about 0.2 × as long as basal width of mandible; tergite I smooth and shiny; metasoma black with yellow bands................................................................................ M . canaliculatus Szépligeti - Malar space about 0.3 × as long as basal width of mandible; apical portion of tergite I with punctures; metasoma yellowish brown.............................................................................................. 4 4 Epicnemial carina reaching about 0.15 the distance to subtegular ridge; ovipositor sheath about 1.1 × as long as hind tibia; upper margin of pronotum, mesoscutum, base of propodeum dark brown to black; fourth and fifth of hind tarsi brown to dark brown............................................................................ M . philippinus Gupta & Gupta - Epicnemial carina reaching about 0.3 the distance to subtegular ridge; ovipositor sheath about 0.9 × as long as hind tibia; upper margin of pronotum, mesoscutum, base of propodeum yellowish brown to reddish brown; fourth and anterior half of fifth of hind tarsi yellowish white................................................ M . rufithorax Sheng, Li & Sun , sp. nov.