12 
Leach 1 s Storm Petrel 
While a few of the white-rumped dark storm petrels observed may have 
been Harcourt*s, which may be nearly indistinguishable from this species 
in the field, probably the greatest majority were Leach*s Storm Petrels* 
Fairly high numbers were recorded in contrast to sparse records in 
1963 and I 96 I 4 . All but one sighting were of single birds* Densities were 
highest between Oahu and the grid, lowest within the grid* 
One bird, attracted and dazed by the lights, was netted from the stern 
while the ship was drifting near Johnston Island the night of November 
18-19* 
Red-tailed Tropicbird 
Numbers within the grid were comparable to those of 1963 while numbers 
outside were noticably higher than in either previous years* All sightings 
were south of 20°, with the highest daily totals below 16°* Thus, 2h of 
the 33 within the grid were south of 16 • 
Seven birds were collected, of all age groups; six were males* Five 
birds were collected within the grid (south of l^ 0 ); these weighed from 
100 to nearly 300 grams more thsn the two collected north of the grid (above 
19°) • This may indicate the presence of two different populations in the 
two areas or may reflect a difference in food supply. 
White-tailed Tropicbird 
Numbers paralleled those of 196U within and outside the grid. All 
but three individuals were recorded above 18°. Two were seen in the grid 
on tte 12th and one was observed about 1 $ miles south of 18°* Eight were 
seen on November 9* 
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