R. Clapp 1964 Oct. 12 Sibylla Island, Taongi Atoll Arose at 6:70 and collected 5 Wandering Tattlers on the windward side of Sibylla. Of particular interest was the similarity of molt in these birds. With the exception of 30013 these birds were essentially the same in their molt. Counting from outward-inward primaries 6-10 (30010-30012) and 7-10 (30009) were the primaries involved in molt. In two 6 was absent; in one 6 was in sheath and in one 7 was in sheath. 8-10 were new feathers. These could be easily distinguished by the blacker color as well as the lesser wear. There was no tail molt except for one individual which was replacing one of the central rectrices of the 12 . Conclusions : 1. Primary molt initiates the replacement of flight feathers and begins before either secondary or rectricial replacement begins. 2. Replacement in the primaries is proximal- distal beginning with P 10. 3. Primary coverts are replaced with their primaries. 4. The preceding feather in the primary molt sequence is partially our of sheath or well grown in sheath before the next primary is dropped. 5. Apparently no more than 2 primaries are non-functional during primary molt. 6. Light body molt is occurring on all birds on about Oct. 12 in the Marshalls. In the afternoon collected some frigate egg white, molluscs, and banded Fairy Tern and R.T.T. Bird. The single Golden Plover collected by Huber in the morning was generally not in molt. A few body feathers were in sheath and two rectrices were in sheath (L2 and Rl. All the other tail feathers appeared old. Crested Tern nests were found on the northern beach of the islet by Binion's party. Some 7 eggs, about 12 adults.