^ DRIFT 
, « Mar.-Gil.-At-Sea * 2 
x etrel, Whiue-necked Petrel, White-tailed Tropicbird and Sooty Tern). An 
additional live species recorded fewer than 5 times in October showed major 
increases in November (Christmas Island Shearwater, Slender-billed Shearwater, 
Phoenix Island Petrel, Harcourts' Storm Petrel and Leachs' Storm Petrel). 
ihough different areas were covered on the two legs between Hawaii and 
His 
the Marshall an Gilbert some apparent trends can be noted. Wedgetailed 
A 
Shearwaters appeared to be moving south at the conclusion of their 1964 breeding 
cycle in the Hawaiian Islands and Johnston Atoll. Cook’s Petrels followed the 
same distribution pattern, however, their southward movement at this time is 
i 
toward breeding grounds in the southern hemisphere. The Sooty, Slender-billed 
and Palefooted Shearwaters also are southern migrants at this time but exhibit 
a much more direct, rapid movement. Sooty Terns appear to.be moving north 
toward their breeding areas in the Hawaiians and at Johnston. The sharp increase 
in White-necked Petrels along the November route seems surprising, since a 
decrease is expected at this time as the birds begin nesting in the Galapagos 
Islands. Perhaps the influx is due to birds moving south from areas north of 
the Hawaiian chain which will soon move on toward South America. 
Approximately the same numbers of birds were present within 300 miles of 
uanu in both months (the higher total on November 27 arising from a longer 
period of observation). In October, if the numbers of Sooty Shearwaters are 
subtracted, total numbers dropped sharply from October 2 to the 3, then remained 
more or less constant through the 7th. The lowest total was obtained on 
October 8 , after which numbers increased as land was approached. Fairly high 
numbers were present on the southern half of the return leg in November, up to 
I 09 W T and l4°N. Exceptionally low numbers were recorded between this area and 
300 miles off Oahu. It is not known why this area should show such a sudden 
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