The taxonomy of the apoid wasps of the genus Carinostigmus from China is studied, with description of four new species, namely Carinostigmus capiconvergens Bashir & Ma, sp. nov., Carinostigmus longivertex Bashir & Ma, sp. nov., Carinostigmus rugipunctatus Bashir & Ma, sp. nov., and Carinostigmus triangularis Bashir & Ma, sp. nov. An updated key to the Chinese species of Carinostigmus is provided.