whitish cast of the head. 
Red-footed Booby ( Sula aula) 
Thirty-five percent of the total number observed were immature birds. 
Approximately 97 percent of the total number of adults observed were 
intermediate and dark phase birds, and nearly 80 percent of these were re¬ 
corded from a single feeding flock north of the Galapagos Islands on 12 
February. The eight light phase adults observed were north of the equator. 
Blue-faced Booby ( Sula dactylatra ) 
Survey area records for this species break down as follows: 90 percent 
adults, 6 percent subadult and A percent immature. Forty percent of the 
adults were recorded from a single feeding flock north of the Galapagos 
Islands on 12 February. No Blue-faced Boobies were observed south of 5°S. 
# 
Magnificent Frigatebird ( Fregata magnificens ) 
All closely observed frigatebirds were this species and in view of the 
distribution data for frigatebirds, probably most or all of the "frigatebird 
species" as well. In the Galapagos, where this species overlaps with the 
Great Frigatebird ( Fregata minor ), the observer experienced some difficulty 
in separating the two and thus nine frigatebirds closely observed in this 
area, which were one or the other of these two, have been included in the 
more general category of frigatebird species. 
Only one frigatebird was recorded south of 5°S* 
Phalarope (sp.) ( Phalaropodidae ) 
This was the second most abundant group in the survey area. Approximately 
83 percent of the total number observed were recorded on 7 February at 13°N, 
in large flocks sitting on the water and, in generally smaller, flying 
flocks. Sixty-five percent of the remaining birds were observed in the 
vicinity of the Galapagos Islands. 
The only positively identified species was the Northern Phalarope 
