_Food habits._--The author (1948:42) found fish and crabs in the stomachs of birds taken at Guam, Ulithi and Peleliu. _Parasites._--Uchida (1918:484, 488, 490) found the following bird lice (Mallophaga) on the Reef Heron at Ponapé: _Nirmus orarius_, _Colpocephalum importunum_, and _Myrsidea teraokai_. Bequaert (1939:81 and 1941:266) found the fly (Hippoboscidae), _Ornithoctona plicata_, on the heron at Kusaie. Wharton (1946:175) and Wharton and Hardcastle (1946:306, 316) obtained chiggers (Acarina), _Neoschöngastia egretta_ and _N. carveri_, from the Reef Heron at Guam and Ulithi. _Remarks._--The species _Demigretta sacra_ contains two subspecies, the widespread _D. s. sacra_ and a larger form, _D. s. albolineata_ (Gray), known from New Caledonia and the Loyalty Islands. The latter subspecies is surrounded by the former, a distribution which closely parallels that in each of the species _Phalacrocorax melanoleucus_ and _Gygis alba_ of Oceania. Recently Delacour (in Delacour and Mayr, 1945b:105) has dropped the name _Demigretta_ placing all of the forms of this genus in _Egretta_. He says, "We cannot accept the genus _Demigretta_, which is based on the more extended feathering of the tibia, the different length and texture of the feathers of the trains, the shortness of the tarsus and the presence of a dark gray color phase. The latter exists in the Madagascan and African subspecies of _Egretta garzetta_." The Reef Heron is a conspicuous member of the bird life of Micronesia, being recorded from most of the island groups. It prefers the placid and shallow waters of the lagoons and tidal beaches where it obtains the littoral animal life as food. The birds are seldom seen inland and usually frequent the beaches and rocky coasts. In this respect there is little opportunity for competition with the migratory Plumed Egret, which prefers the grassy upland and marsh areas and inland ponds. The Reef Heron is a quiet, usually solitary, and retiring bird, being exceedingly difficult to approach, especially when found on the open tidal flats.