A new subgenus of the genus Hylaeus Fabricius, 1793 is described and illustrated. The subgenus Laxoprosopis subgen. nov. is erected for one new Chinese species, H. (Laxoprosopis) sichuanensis sp. nov. In addition, H. nipponicus Bridwell, 1919 and H. monticola Bridwell, 1919 are recorded from China for the first time.