(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 (7 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 Galapagos 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's Shearwater, Galapagos Storm Petrel, Swallow-tailed Gull and Fairy Tern.