3 
were the Juan Fernandez race (P.e_. externa ; some of the unidentified 
large Pterodroma may have been the White-necked race (P.e_. cervicalis ) . 
Phoenix Island/Tahiti Petrel No» of Birds Recorded: 6 
( Pterodroma alba/rostrata ) 
The usual few scattered sightings of this bi-species complex were 
recorded. At least two of the three sightings on 12 October were almost 
positively identified to Phoenix Island Petrels. At close range under 
good light the white tracings of the underwings and throat can be seen. 
Mottled Petrel No. of Birds Recorded: 2 k 
( Pterodroma inexpectata ) 
The first sighting of this species occurred on 10 October at 09 ° 50 T N. 
From there south a few birds were recorded each day through 2 November; 
all were moving in fast, direct flight either in southerly or southwest¬ 
erly directions. 
Black-winged Petrel No. of Birds Recorded: 92 
(Pterodroma hypoleuca nigripennis) 
This form had much the same distribution as the Juan Fernandez Petrel 
None was seen just south of Oahu on J Oct., but between 8 to 11 October the 
birds were common. In this respect they ranged commonly farther south(to 
6 °N) than did the Juan Fernandez. Of 67 birds recorded as to flight 
direction, (66 percent) were traveling in SE, S, or SW directions. 
White-winged Petrel No. of Birds Recorded: 6 
( Pterodroma leucoptera ) 
Five scattered sightings of the white-breasted form were recorded 
between 9 ° and 15 °N. A dark breasted individual was recorded on 1 Nov¬ 
ember at 6°33 r S. 
Bulwer's Petrel No. of Birds Recorded: 9 
(Bulweria bulwerii ) 
Occasional scattered sightings of this species were recorded through¬ 
out the cruise and probably represent individuals of both northern and 
southern populations. 
White-rumped Storm Petrel No. of Birds Recorded: 7 
(prob. Oceanodroma leucorhoa ) 
Unusually low density of this group recorded throughout. Four of 
the seven birds were observed at 2 ° 35 t N. I had assumed that high densities 
comparable to the southern grid area were to be found in a broad belt all 
