Three new species ofCarinostigmusTsuneki from the Oriental Region of China are described:Carinostigmus frontirugatusBashir & Ma,sp. nov.,C. latidentatusBashir & Ma,sp. nov., andC. vesulcatusBashir & Ma,sp. nov.In addition, ten species are reported, of whichCarinostigmus palawanensis(Tsuneki) is recorded in China for the first time. A key to known and new species of the genusCarinostigmusTsuneki from China is provided.

Four new species of genus Passaloecus Shuckard, (Crabronidae: Pemphredoninae: Pemphredonini) from China are described, namely P. bisulcatus Bashir & Ma, sp. nov., P. profundesulcatus Bashir & Ma, sp. nov., P. tuberangustus Bashir & Ma, sp. nov., and P. tuberculiformis Bashir & Ma, sp. nov. In addition, eight Palearctic species are reported, of which P. turanicus Gussakovskij and P. turionum Dahlbom are first records for China. A key to the species of Passaloecus from China is provided.

Two new species of the genus Psen Latreille, 1796, namely Psen fronistriatussp. nov. and Psen scabrosussp. nov. are described and illustrated from China. A key to the Chinese species of Psen is also provided.

Two new species of the genus Trypoxylon (Hymenoptera: Crabronidae: Crabroninae: Trypoxylini) from Yunnan Province, China: T. aphelothoracicus Fu & Li, sp. nov. and T. ferrugineipes Fu & Li, sp. nov. are described and illustrated. The female of T. infoveatum Li & Li, 2007 is described for the first time. In addition, ten species of Trypoxylon are newly recorded from China: T. buddha Cameron, 1889, T. flavipes Tsuneki, 1979, T. fulvocollare Cameron, 1904, T. gampahae Tsuneki, 1981, T. imayoshii Yasumatsu, 1938, T. kandyianum Tsuneki, 1979, T. khasiae Cameron, 1904, T. nasale Tsuneki, 1979, T. pahangense Tsuneki, 1979, and T. pendleburyi Tsuneki, 1979. An updated key to Trypoxylon of Southwest China is provided.

The genus Polemistus de Saussure (Crabronidae: Pemphredoninae: Pemphredonini) from China is reviewed and a key to the Chinese species is provided. Four new species, Polemistus clypeisinuatus and Polemistus gutianus from Zhejiang Province, and Polemistus divaricatus and Polemistus pediflavidus from Yunnan Province are described and illustrated.

Based on the key diagnostic characteristics such as petiole, clypeus, and hypersternaulus, five new species of Passaloecus from China are identified: P. clypearcuatus Li & Ma, sp. nov., P. clypeconvexus Li & Ma, sp. nov.P. edentutus Li & Ma, sp. nov., P. margdentatus Li & Ma, sp. nov., and P. sternoleios Li & Ma, sp. nov. Detailed descriptions, diagnoses, and photographs of diagnostic characteristics are provided for these new species. Additionally, a key to the known species of Passaloecus in China is updated and illustrated, further enhancing the understanding of biodiversity within this genus.