94 BIRDS OF HAWAIIAN ISLANDS. 



graduated tail. It is in reality closely allied to P. sphenuriis, and conse- 

 quently very distinct from any Shearwater hitherto known to occur in 

 the Eastern Pacific. The discovery of the present species in the Ha- 

 waiian Archipelago, therefore, is one of particular interest. With no 

 specimens of P. sphenurus for direct comparison, it is difficult to state 

 the structural differences between the two species, especially since the 

 size ami proportions seem to be nearly the same, though P. knudseni 

 has apparently somewhat shorter toes than P. sphenurus. 



I have but little to add to the above diagnosis, except that the. re.'i- 

 iges are white at the base of the inner webs, the white gradually in- 

 creasing inwards, so that on the proximal secondaries it occupies the 

 basal half of the inner web. 



Iu general coloration the new species bears great resemblance to P. 

 {iavia*{F0R*T.) and P. creatopus (Coues), but besides being easily dis- 

 tinguished from both by its long tail and the shape of the nasal tubes, it 

 differs from P. gavia in being much larger and in having gray axillariesj 

 while its white lining of the wing and the absence of gray mottling on 

 the throat and sides of neck distinguish it from P. creatopus* 



Mr. Knudsen writes me in regard to the present species, which, accord 

 ingto his label, is called "Uau kaue" 1 by the natives, that it was for- 

 merly found plentiful every summer ac the top of the mountains as high 

 up as 5,000 feet, where they had their nests in long burrows, but that 

 in the last ten years they have become rare, as the foreign rats kill 

 them in their nests. 



-| Anous melaaogenys Gray. 



Black-cheeked Noddy. No,0 V 



1846.— Anous melanogenys Gray, Gen. B., ill, pi. clxxxii. 



1854.— f Anous tenuirpslris Lichtenstein, Nomencl. Av. Mus. Berol.,p. 97 (nee Temm.1 



Mr. Knudsen sends four .specimens of this addition to the Hawaiian 

 fauna, all four being from the island of Niihau. Mr. Dole (Haw. Aim., 

 1ST!), p.57)only enumerates A. stoh : d us (Linn.) as occurring in the Hawai- 

 ian Islands, but the two species are very similar aud may easily be 

 confounded. On the other hand, the ranges of the two species are such, 

 as to make it probable that both may occur in the same archipelago. 



The chief differences between the two species are as follows: 



A. melanogenys is a smaller bird with the bill much slenderer and 

 straigkter, its height at base being 7 to 7.5— against 10— iu A. stolM 

 dus ; in the former the whole top of the head is distinctly whitish, while 

 in tie latter the forehead only is whitish. In the Southern Pacific the J 

 is a speei.-s similar to .1. melanogenys, viz, A. leucocajnllus Gould, but 

 this has the white of the top of the head abruptly defined behind, and 

 not fading gradually into the dark ashy on t he upper neck. Anothe r 



* giace the above was placed in the printer's hand Mr. Salvin (Ibis, 1888, p. 3.">3) 

 has described a Puffinus cuneatus, which, in some respects, agrees closely with our 

 bird. His description differs, however, in several important points, making it proj 

 able that we have to do with two different species. 





