6 . 
figure 9)• The color phase ratios for the various days are quite 
interesting. Basically there was a light phase population north of 
7°N extending to l4°N. South of 5°N there were mainly dark phase 
birds. The nearest island where the species nests is San Benedicto, 
over 700 miles away off the coast of Mexico. However, dark phase 
birds outnumber light phase birds two to one on this island. There¬ 
fore, we can conclude that the birds seen between 7°N-1^°N were not 
from San Benedicto, for if they were, we would have expected a much 
higher proportion of dark phase birds. 
The only light phase populations close to this area are present 
on Johnston Atoll and the Hawaiian Islands. It therefore seems likely 
that the individuals seen between 7° and 1^°N are from these island groups. 
Since only a small number of individuals were seen, it seem unlikely 
that this is the main wintering area for the population. Possibly it 
is further east and south. Data collected on the JORDAN and ROCKA¥AY 
will either prove or disprove this idea. 
Sooty Shearwater ( Puffinus griseus ) 
One individual of this species was seen on 5 March as it headed 
north. 
Manx Shearwater ( Puffinus puffinus ) 
The subspecific identity of this species was not determined, but 
it is most likely auricularis of the Mexican coast. One individual 
was seen as far south as 6 ° 50 r N, although most of them were seen north 
of lk°N. 
Juan Fernandez Petrel (Pterodroma externa externa) 
Juan Fernandez Petrels were seen in small numbers north of the 
