48 
PACIFIC SCIENCE, Vol. IX, January, 1955 
tilled on Christmas Island during the period 
October 23-December 9, 1953. Of this num- 
ber, 11 species were observed with eggs or 
with eggs and young. The author believes 
this to be the first report of the occurrence 
of the crested tern and the ring-billed gull on 
Christmas Island or for the Line Island area. 
ADDENDUM 
Since the submission of this manuscript 
the author has made another visit to Christ- 
mas Island, June 5 and 6, 1954. Other duties 
prevented a thorough survey of the Island, 
but through the courtesy of British District 
Officer Percival Roberts, a short trip was 
made to the islet of Motu Tabu. Species ob- 
served nesting with eggs and young were the 
Christmas shearwater, white-capped noddy, 
common noddy, white tern, and red-tailed 
tropic bird. The Phoenix petrel was brooding 
eggs, but no young were seen. The blue-grey 
noddy was quite abundant on the islet, but 
no eggs or young could be found. Sooty 
terns, crested terns, frigate birds, and red- 
footed boobies were observed flying over the 
lagoon. Some of the Gilbertese plantation 
staff informed us that the sooty terns had not 
yet started to nest but had already begun to 
congregate on the main island for their sum- 
mer nesting season. 
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