Gadfly Petrels (Fterodroma spp.) 
The general Inexperience of the observers on this trip made 
accurate identification of the species belonging to this group 
very difficult. One T 2hite-necked Petrel ( Pterodrorra externa ) and 
several Bonin Island Petrels (Pterodroma hvpoleuca) were identified. 
In general, however, the group as a whole appeared in increased numbers 
from April and Kay. Of the 101 Individuals recorded during the trip 
63 were within the grid area.. 
On 15 June one Bonin Island Petrel flew aboard ship at 0330 
hours. Two Bonin Island Petrels were collected. 
Bulwer 1 s Petrel ( Bulweria bulwer 5 i ) 
Of the ll|2 birds observed most were found on the return trip 
down the Leeward Chain and near Oahu. None were found within the 
grid which completes the downward trend in numbers from the high 
found in April. This may be the result of the commencement of breeding 
activities on the islands. Two specimens were collected. 
Harcourt’s Storm Petrel ( Oceanodroma castro ) 
Only three individuals were recorded representing a greatly 
reduced at sea population over May. None were recorded within the 
grid area. No specimens were collected. 
Red-tailed Tropicbird ( Fhaethon rubricauda ) 
Twenty seven birds were recorded of which 8 were within the 
grid area, and 7 were found between Oahu and Johnston Island. 
Three specimens were collected. 
