Some Birds of Molokai. 53 
auxiliaries forming a patch on the side of the body under the 
wings in Galapagos specimens are entirely wanting in all Hawaiian 
specimens in the Museum; even the immature bird from Hilo 
beach. In sandwichensts the white frontal band is wider and the 
black bases to the white feathers composing it do not reach to the 
base of the beak, as in fhe@opygia. ‘The whole back and wings are 
blackish slate, with the feathers of the mantle inconspicuously, if 
at all, marked, with paler tips (not slate black with conspicuous 
whitish terminals as in ph@opyg7a). ‘The outer pair of tail feathers, 
viewed from above, vary somewhat, but they are always in both 
adult and immature birds, strongly mottled with white on their 
inner, and to some extent, on their outer webs. 
I regard phe@opygia and sandwichensis as distinct, though 
closely allied species with the latter possessing characters of color, 
measurement and habitat sufficiently marked to distinguish it 
from the former in all ages and both sexes. I, therefore, adopt 
Ridgway’s name as published in the text of the Water Birds of 
North America (vol. ii, p. 395, 1884) as the proper designation for 
the Uau (not Uuau as sometimes erroneously given), or Hawaiian 
Dark-rumped Petrel. 
Puffinus newelli Henshaw. 
Unfortunately, I did not secure a specimen of this rare bird, 
though I had the pleasure of examining one that had been pre- 
served by Mrs. Wilson. It had been collected some years before, 
from one of the steep cliffs toward the summit of the mountain 
between Pelekunu and Waikolu valleys. The description taken 
from it accords exactly with a specimen in the Museum collection 
from Kauai. ‘The bird is known on Molokai as Ao—the name 
being an imitation of its noéturnal cry. Pelekunu natives in- 
formed me that during the ‘‘bird season’’, early in October, the 
adults and young can be collected in considerable numbers from 
the cliffs. They were quite clear as to the distinguishing char- 
acters between the Uau and the Ao; giving differences which an 
unobservant person would have passed over. ‘Therefore, I have 
every reason to have confidence in what they told me concerning 
their habits. They assured me that some birds were seen, or 
rather heard, throughout the year (?), but that they became plenti- 
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