As shown in previous reports a majority of the white-ruraped Storm 
Petrels observed in this area are probably 0* leucorhoa . The figures 
for 1963 and 1964 are quite comparable and indicate the return of birds 
from their arctic breeding grounds. No specimens were collected. 
Red-tailed Tropicbird ( Phaethon rubricauda ) 
Oct., 1964 Nov., 1964 Nov., 1963 
Grid 27 12 37 
Non-Grid 10 3 8 
The peculiar fluctuation in numbers of birds of this species from 
month to month is still unexplainable and consequently unpredictable. 
They are, however, quite regular and widely spread at any time of the 
year within this area. No specimens were collected. 
White-tailed Tropicbird ( Phaethon lepturus ) 
Oct., 1964 Nov., 1964 Nov., 1963 
♦ Grid 033 
Non-Grid 20-13 3 
As with the preceeding species the fluctuation in numbers of birds 
is still unexplainable. Ond specimen was collected. 
Blue-faced Booby ( Sula dactylatra ) 
Oct., 1964 Nov., 1964 Nov., 1963 
Grid 4 4 4 
Non-Grid 11 2 .2 
The expected increase in numbers this month did not occurr, although 
within the grid at least, their numbers remained constant. One specimen 
i 
was collected. 
i 
