Vor. II, Pr. IT] LOOMIS—A REVIEW OF THE TUBINARES 121 
two species, see the account of the latter.) As shown in the 
accompanying table, the measurements of the specimens of P. 
auricularis from the Revilla Gigedo and Hawaiian archipela- 
goes overlap.* 
The following are the colors of the naked parts as taken in 
the flesh by Mr. Gifford: “Upper mandible blackish with 
bluish spot on each side near base; lower mandible blackish 
above sulcus and at tip, blue below sulcus; orbital ring black; 
iris dark brown; feet pinkish white, with some black on toes 
and edges of webs.” 
The five downy young from the Carnegie Museum exhibit 
several stages in the development of plumage. No. 21943, 
May 1, 1897, and No. 21938, April 30, 1897, are in the pro- 
toptyle state, and in color are dark smoke gray, becoming 
grayish white on the lower parts. No. 21951, May 23, 1897, 
is more advanced, the mesoptyles having appeared. The col- 
oration is the same as in the preceding. No. 21937, April 30, 
1897, is still older and has the protoptyles much worn. It is 
like the others in color, the dark smoke gray and grayish white 
reaching to the very base of the mesoptyles. No. 21954, May 
25, 1897, is passing out of the natal down into the definitive 
feathers. The protoptyles have almost disappeared. Vestiges 
of grayish white ones remain on the jugulum. As the mesop- 
tyles all appear to be dark smoke gray, perhaps a double colora- 
tion existed in this bird, the protoptyles being light and the 
mesoptyles dark on the lower parts. 
The adults from the Clarion and San Besedicta colonies 
(taken between the Ist and 31st of May) are in worn plumage 
and almost without exception show feather renewal in progress 
beneath the surface, apparently the beginning of a postnuptial 
moult. Three Expedition birds (obtained on the 9th and 12th 
of October) are finishing a complete moult. 
1 Obviously, Pufinus Ba NCnan Mathews & Iredale (Ibis, 1915, p. 594) is a 
variation of Puffinus auricularis C. H. Townsend, which Messrs. Mathews and Iredale 
confuse with Putinus opisthomelas Coues. See my account of this latter species, 
