(along 98°W); E) 5°N to 15°N to Panama- This breakdown is essentially 
arbitrary, but for the present will allow for comparison between different 
segments of the cruise track. 
Area A yielded well over half the total number of birds observed on the 
cruise, while 72 percent of the area total was noted on a single day (j 
February, the first day out of La Union). Observations for this day, and 
thus for this area, were characterized mainly by Wedge-tailed Shearwaters, 
Least Terns, tern species and phalarope species. These occurred primarily 
in large feeding and/or travelling flocks, the former generally of mixed 
species composition. Red-footed, Brown and Blue-faced Boobies were the 
next most abundant species, with other species occurring intermittently, 
many in the flocks of 7 February. The only two Dark-rumped Petrels of the 
cruise were noted in this area. 
The western counterpart (98°W to 105°W) of Area A on the return phase 
of the cruise, Area E, was dominated by Leach Storm Petrels. Wedge-tailed 
Shearwaters (one) and Least Terns (three) were notably absent, and tern 
species and phalarope species were not nearly as abundant as in Area A. 
Red--footed and Blue-faced Boobies were observed almost daily. The one 
comparatively large feeding flock of Sooty Terns noted on the cruise (50 
birds) occurred in this area. 
Area B was characterized by species originating mainly in the Galapa¬ 
gos Islands. White-rumped storm petrels were dominant, and several positive 
identifications of the Galapagos Storm Petrel were made. A single mixed- 
species feeding flock (12 February) accounted for approximately 50 percent 
and 95 percent respectively, of the two next most abundant species, the 
Blue-faced Booby and the Red-footed Booby. Four species recorded on the 
cruise were observed only in this area: Audubon 1 s Shearwater, Galapagos 
Storm Petrel, Swallow-tailed Gull and Fairy Tern. 
