New records of Micropezidae (Diptera, Acalyptratae) from South Korea, with description of a new species of Rainieria Rondani Author Kim, Wonwoong 0000-0001-5837-1048 College of Literature, Science, and the Arts, University of Michigan-Ann Arbor, Michigan, United States of America. wonwoong @ umich. edu; https: // orcid. org / 0000 - 0001 - 5837 - 1048 wonwoong@umich.edu Author Weele, Ruud Van Der Kloosterlaan 6, NL 4111 LG Zoelmond, the Netherlands Author Lee, Seunghwan Insect Biosystematics Laboratory, Department of Agricultural Biotechnology, Seoul National University, Seoul 151 - 921, Republic of Korea. & Research Institute for Agricultural and Life Sciences, Seoul National University, Seoul 151 - 921, Republic of Korea text Zootaxa 2022 2022-08-24 5178 1 26 40 journal article 129661 10.11646/zootaxa.5178.1.2 66ceb082-2ee4-4e5f-bec4-950a35c67451 1175-5326 7021824 7EB6ABDB-A942-4DB9-8E2B-B29844FFDB2A Key to the Palearctic and Micronesian species of Rainieria 1. Male sternite 5 elongate, area excluding the fork twice as long as the genital fork—[ Japan (Ogasawara Islands)]........................................................................................ boninensis (Hennig, 1935) - Male sternite 5 stout, area excluding the fork shorter or about as equal to the length genital fork ( Fig. 5 )................ 2 2. Mid and hind femora yellowish brown, with black ring of approximately 1/5 the length of femora at the apical 3/4 portion; wings uniformly infuscate, with faint discal band—[ China (Southwest), Taiwan ]............... leucochira Czerny, 1932 - Mid and hind femora predominantly dark brown, with yellowish brown preapical ring ( Fig. 3 )........................ 3 3. Wings evenly infuscate, without dark discal band; basal half of mid- and hind femora gradually transitioning into lighter brown; extreme base of mid- and hind tibia without yellowish brown ring [Europe (Central, East)].......... latifrons ( Loew, 1870 ) - Wings evenly infuscate with dark discal band; extreme base of mid- and hind femora often with a yellowish brown ring... 4 4. Short stout setae of the male sternite 5 varying in length, most long at the basal 1/4 region of the arm and gradually shortened to the apical portion of arm—[ Russia (Far East), Japan (Honshu)].............. hennigi Krivosheina & Krivosheina, 1996 - Short stout setae of the inner side of arm in male sternite 5 uniform in length...................................... 5 5. Male sternite 5 with slightly incurved arm (fig. 5A), female sternite 3 – 4 strongly reduced (fig. 6C–D); pleural membrane uniformly dark brown with distinct triangular white region below T 3–4 in female—[ China (Northeast), South Korea ].................................................................................... triseta Li, Liu & Yang, 2012 - All female sternite well developed ( Fig. 6A–B ); pleural membrane uniformly dark brown ( Fig. 3A–B, E–F )............. 6 6. Hind tarsus uniformly dark brown; male sternite 5 with short stout setae of inner arm uniformly distributed, basal cleft triangular ( Fig. 5B ); epandrium relatively stout; phallic bulb almost reaching the base of epandrium; tip of distal distiphallus blunt ( Fig. 5E )—[ South Korea ]........................................................... tenebrosa Kim & Lee sp. nov. - Hind metatarsus white, hind tarsus otherwise dark brown; male sternite 5 with short stout setae of inner arm sparsely distributed in the middle, basal cleft significant ( Fig. 5C ); epandrium elongate; phallic bulb only reaching the middle half of the epandrium; tip of distal distiphallus distinctly sharp distally ( Fig. 5F )—[Europe (Central, East, West, North, South)]... calceata (Fallén, 1820)