The genus Hercostomus Loew (Diptera, Dolichopodidae, Dolichopodinae) from Inner Mongolia, China, with the description of two new species Author Qian, Xingyang Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, Inner Mongolia 010010, China Author Wang, Ning Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, Inner Mongolia 010010, China wangningis@163.com Author Yang, Ding Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China dyangcau@126.com text ZooKeys 2022 2022-08-24 1118 119 131 http://dx.doi.org/10.3897/zookeys.1118.84403 journal article http://dx.doi.org/10.3897/zookeys.1118.84403 1313-2970-1118-119 862064A30C52401AAA0C10D33D626A66 F3FF607969335274A13EC39C7F1A6F23 Hercostomus beijingensis Yang, 1996 Fig. 2 Hercostomus beijingensis Yang, 1996: 318. Type locality: China: Beijing, Yingtaogou. Diagnosis. Antenna entirely black; postpedicel 1.8 times longer than wide, blunt at tip. Metapleuron yellow. Abdominal tergites 1-3 yellow at lateral margin. All coxae entirely yellow. Male cercus nearly quadrate. Phallus thin and long, apically geniculate. Figures 2-5. Habitus, lateral view 2 Hercostomus beijingensis Yang, 1966, male 3 Hercostomus chifengensis sp. nov., holotype male 4 Hercostomus dilatitarsis Stackelberg, 1949, male 5 Hercostomus neimengensis Yang, 1997, female. Scale bars: 1 mm. Specimens examined. Holotype : male, China , Beijing , Xiangshan , Yingtaogou , 1987.V.30 , Ding Yang (CAU) . Other material : 2 males , China , Inner Mongolia , Tongliao , Daqinggou , 200-300m , 2014.VII.22 , Ning Wang & Ding Yang (CAU) . Distribution. China (Inner Mongolia, Beijing, Henan, Shanxi, Hubei).