The species of Siobla Cameron from Shaanxi, northwestern China are investigated. Seven new species are described： Siobla centralia Niu ＆ Wei sp. nov., S. curvata Niu ＆ Wei sp. nov., S. listoni Niu ＆ Wei sp. nov., S. pseudoplesia Niu ＆ Wei sp. nov., S. qinba Niu ＆ Wei sp. nov., S. shaanxi Niu ＆ Wei sp. nov., and S. vulgaria Niu ＆ Wei sp. nov. A key to the 26 known species of Siobla from Shaanxi is provided.
Odontocimbex svenhedini Malaise is redescribed based on new material and types. The diagnosis of Odontocimbex is outlined. The differences between Odontocimbex and Cimbex, Palaeocimbex and Trichiosoma are discussed. The female of the species is described for the first time. The lectotype of O. svenhedini is designated. A key to the Asian genera of Cimbicidae is provided.
The genus Aneugmenus Hartig, 1837 is redescribed, and differences between Aneugmenus and Birka Malaise, 1944, Atoposelandria Enslin, 1912 and Linorbita Wei ＆ Nie, 1998 are briefly discussed. The known species and host plants of this genus are reviewed. A worldwide list of species is provided, Aneugmenus is separated into 6 species groups. Aneugmenus nigrofemoratus sp. nov. is described from China A key to the world species excluding Neotropical in this genus is provided. The generic position of some species related to Aneugmenus is briefly discussed. Two new combinations and a new synonym are proposed： Linorbita ungulica （Wei, 1997）, n. comb = Aneugmenus mandibularis Wei, 1997, syn. nov. , and Paraneugmenus frontalis （Wei, 1997）, n. comb all transferred from Aneugmenus.
