This paper reports two new species of the family Mazocraeidae from the Pearl River Estuary and the Xijiang River, China. Mazocraeoides xijiangensis n. sp. is found on the gills of Macrura reevesi (Richardson) and Heteromazocraes hexacanthus n. sp. on the gills of Coilia grayi Richardson. A new species name, Heteromazocraes lingmueni, is given to replace Paramazocraes sp. of Ling (1973).