Previously, no records of Syntormon Loew, 1857 species were known from Inner Mongolia (China). The genus is reported here from Inner Mongolia for the first time, with the description of a new species, S. sinicumsp. nov., along with two previously described species, S. dukha Hollis, 1964 and S. henanense Yang & Saigusa, 2000. Syntormon sinicumsp. nov. and S. dukha Hollis, 1964 are barcoded for the first time to support the species delimitation. A key to Syntormon species in China is provided.

Eight species of Dolichopus Latreille were previously recorded in Inner Mongolia. However, there have been only a few studies on their potential distribution. Here, three newly discovered species from Inner Mongolia are described, namely Dolichopus (Dolichopus) apicimaculatus sp. nov., Dolichopus (Dolichopus) jiufengensis sp. nov., and Dolichopus (Dolichopus) luae sp. nov. There were also twelve known Dolichopus species that were newly recorded in Inner Mongolia, including the newly recorded subgenus Hygroceleuthus. A key to the Dolichopus species from Inner Mongolia and the potential geographic distribution of Dolichopus in Inner Mongolia were provided. Potential geographic distribution of the genus in Inner Mongolia were determined as well.