_Remarks._--Like _F. minor_, the Least Man-o'-War has not been observed often in Micronesia. Marche obtained one female at Rota in June, 1888. D. H. Johnson saw a bird thought to be of this species at Agfayan Bay, Guam, on 4 June 1945. Records from the western Carolines are few. There are no reports of this bird from the Palaus and the Marshalls. It may breed on some of the atolls in the Carolines. The two species of man-o'-war birds may be difficult to distinguish in the field. The smaller size of _Fregata ariel_ is perhaps the most useful character although it may be easily recognized also by the presence of the white flank patch, if it can be observed. Both of the species of _Fregata_ discussed in this report have representatives in the Atlantic, Indian and Pacific oceans. Murphy (1936:920) has shown that the man-o'-war birds are able to cross the Isthmus of Panamá between the Pacific and Atlantic oceans. This route may also be the means of dispersal for other species. The irregular distribution of these birds as well as of other sea birds in the oceanic islands of the Pacific may be caused by their remaining over waters which contain preferred foods and their avoidance of waters which lack preferred foods. =Butorides striatus amurensis= Schrenck Amur Green Heron _Ardea (Butorides) virescens_ var. _amurensis_ Schrenck, Reise Amur Lande, 1, pt. 2, 1860, p. 441. (Type locality, Amurland.) _Butorides striatus javanicus_ Hand-list Japanese Birds, rev., 1932, p. 183 (Koror, Babelthuap). _Butorides striatus amurensis_ Hand-list Japanese Birds, 3d ed., 1942, p. 204 (Babelthuap, Koror); Mayr, Birds Southwest Pacific, 1945, p. 302 (Palau). _Geographic range._--Breeds in northeastern Asia, China, Japan, Bonins. Winters south to Philippines and Malaysia. In Micronesia: Palau Islands--Babelthuap, Koror. _Specimens examined._--Total number, 2 females, from Palau Islands, AMNH--exact locality not given (Nov. 13, Dec. 17-18). _Remarks._--The Amur Green Heron has been recorded as a winter visitor to the Palau Islands. Two females taken by Coultas in November and December, 1931, are immature. He comments (field notes) that he saw, in all, three birds in taro patch and mangrove swamp habitat. =Bubulcus ibis coromandus= (Boddaert) Cattle Egret _Cancroma Coromanda_ Boddaert, Table Pl. enlum., 1783, p. 54. (Type locality, Coromandel.) _Ardeola ibis coromanda_ Hand-list Japanese Birds, rev., 1932, p. 183 (Koror). _Bubulcus ibis coromandus_ Hand-list Japanese Birds, 3d ed., 1942, p. 204 (Koror, Babelthuap); Mayr, Birds Southwest Pacific, 1945, p. 302 (Palau). _Geographic range._--India, Ceylon, east to China and Japan and south to Malaysia. In Micronesia: Palau Islands--Babelthuap, Koror. _Remarks._--The Japanese ornithologists have recorded the Cattle Egret from Babelthuap and Koror in the Palau Islands. It is a winter migrant.