The groups at Mt. Kuring-gai and Maroota, Nos. 1, 4 and 5, comprise some of the outstanding series of rock engravings known in the Sydney-Hawkesbury district, and every effort should be made to protect them from vandalism. The Mt. Kuring-gai group was reported to the Australian Museum over fifty years ago when Etheridge (1904) published a brief description of the principal figures. The Devil's Rock group at Maroota has been known for an equally long time but the other groups described herein were not reported until the last decade.