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Wedge-tailed Shearwater 72 
( Fuffinus pacificus ) 
Two major concentrations were recorded. Predomiriantly dark phase 
birds were found in the Central Pacific Water Mass and mainly light phase 
birds in North Equatorial Current waters. These latter may have been from 
Clipperton Island where large numbers were recorded at this time last year. 
Approximately equal nximbers of both color phases were recorded on the pres¬ 
ent cruise. One light phase bird was collected over an oil slick. 
Sooty Shearwater 
( Fuffinus griseus ) 
Slender-billed Shearvra.ter 7 
(Fuffinus tenuirostris ) 
The few scattered sightings of these very numerous species indicate 
that the northward spring migration is not through this area of the Pacific. 
One Slender-billed Shearwater vras collected over an oil slick on 19 March 
and a Sooty Shearwater came aboard on the night of 26-27 ^'^^rch. 
« 
Townsend's Shearwater 484 
( Fuffinus puffinus auricularis ) 
Manx Shearwater 181 
( Puffinus puffinus opisthomelas ) 
These two races of the common shearwater are readily distinguishable 
from each other even at fairly good distance. The Manx is browiush dor- 
sally with dark flank patches. Tovmsends is quite black dorsally with 
prominent white "rump patches" as in the Havraiian race newelli . 
A concentration of Manx Shearwaters was noted on 20 February near San 
Benitos Island and another lesser concentration in a huge mixed feeding 
flock of Sooty Terns and Townsend’s Shearwaters on 22 February at the mouth 
of the Gulf of California. One specimen of Townsend’s Shearwater was collect¬ 
ed from this flock, 
Dark-rumped etrel 3 
( Fterodroma phaeopygia ) , 
One specimen was collected at 2^—30 Nj 105®W. At this locality the 
bird could conceivably be from either the Hawaiian area or the Galapagos 
and racial designation must await comparison of known origin specimens. 
Juan Fernandez Petrel 35 
( Fterodroma externa externa ) 
White-necked Petrel 1 
( Fterodroma externa cervicalis ) 
Juan Fernandez Petrels \^ere scattered in low numbers throughout all 
pelagic areas. Practically every individual was in heavy molt with large 
white patches in the primary and secondary regions. Two specimens were coll¬ 
ected over oil slicks. j. 
The one sighting of White-necked Petrel was unmistakable and I am cer¬ 
tain that none of these were recorded as Juan Fernandez ■^etrels. This in¬ 
dividual was in completely new fresh plumage indicating an earlier molt 
than in the Juan Fernandez Petrels. 
