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Cook's Petrel A=0 B=33 0=2 
The majority of birds were seen between Swain's Island and 
Jarvis Island during the period 4-6 August. Most sightings of this 
species have been recorded south of the equator on previous SIC 
cruises. With the aid of collected specimens, personnel on the 
present cruise were able to verify certain field characters which 
allow fairly certain field separation of this species from similar 
small Pterodroma . Two specimens were collected. 
Bonin Island Petrel A= 1 B=0 C= 1 
Black-winged Petrel A=83 B=2 C=33 
Pterodroma hvnoleuca A=18 B=0 C= 8 
The few Bonin Island Petrels were recorded Just south of Oahu. 
Black-winged Petrels were regularly recorded throughout the entire 
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at-sea between Oahu and the Southern Grid. The same distribution was 
noted during Aprll-May 1966, but the species was absent from the 
area during the January-March 1966 cruise. The majority of Pterodroma 
hvnoleuca unidentified to race were likely referrable to Black-Winged 
Petrels, i.e., birds not viewed in close enough range to determine 
racial field characters were recorded only as P. hynoleuca . Three 
specimens of Black-winged Petrels were collected. 
« 
Bulwer's Petrel A=10 3=2 0=31 
Scattered sightings were recorded throughout the at-sea area 
with unusually low numbers south of the equator. The only concentration 
was noted on 26 August, the day of arrival in Honolulu. During April" 
May these petrels were abundant from the Line Islands to Oahu. 
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