:ANOUS. 413 



2. Anous pileatus. 



Le Petit Fouquet des Philippines, Sonn. Voy. Nouv. Guin. p. 125, t. 85 \ 



Sterna pileata, Scop. Del. Faun, et Flor. Insubr. ii. p. 92, ex Sonnerat^ 



Anous pileatus, Gray, Gen. Birds, iii. p, 661 '. 



Anous stolidus pileatus, Hartert, Nov. Zool. vii. p. 9 *. 



Anous rousseaui, Hartl. Beitr. Orn. Madag. p. 86 ^ 



Anous stolidus rousseaui, Ridgway, Pr. U. S. Nat. Mus. xix. p. 645 ^ 



Anous stolidus (nee Linn.), Scl. & Salv. Ibis, 1859, p. 233'; Lawr. Mem. Best. Soe. N. H. ii. 



p. 318 ' ; Baird, Brewer, & Ridgway, Water-Birds N. Amer. ii. p. 325, pt. ° ; Saunders, Cat. 



Birds Brit. Mus. xxv. p. 137 ". 

 Anous stolidus ridgwayi, Anthony, Auk, xv. pp. 36, 316" ; Nelson, N. Amer. Fauna, no. 14, p. 26". 

 Anous ridgwayi, Sharpe, Hand-1. Birds, i. p. 137 "j Gates, Cat. Eggs Brit, Mus. i. p. 198, t. 15. 



fig. 6- 



A. stolido similis, sed saturatior, nigricantior, notseo toto, gutture et pectore antico plumbeo lavatis ; facie 

 laterali nigrioanti-plumbea, loris et regione oculari nigerrimis ; palpebris albis ; pileo antico cauescente, 

 fronte basali et linea angusta superciliari albis, pileo postico graduatim cinereo, nucha vix a collo reliquo 

 diversa. Long, tota circa 15-0, alae 10'7, caudae 6'4, culm. 1'5, tarsi 0'85. (Descr. feminse adultse ex 

 Clipperton I. Mus. Eothschild.) 



Hab. Eevillagigedo Is., Socorro I. (Anthony ''^^). — W. Mexico, Isabel Island off San Bias 

 (Grayson^, Nelson^'^), Tres Marias Is. {Nelson ^^), Clipperton I. {Beck) ; Guatemala, 

 Pacific coast {0. S. "'). — Pacific Ocean generally, from the Philippines and coast of 

 China to Laysan * '^^. 



The Pacific Noddy appears to be distinguishable from the true A. stolidus of the 

 Atlantic, but its full range has yet to he determined. I see no reason, however, for 

 doubting the conclusion arrived at by Mr. Hartert, that the birds examined by him 

 from the Caroline Islands are specifically identical with those from the Revillagigedo 

 group ; a Formosan specimen in the British Museum also seems to be of the same 

 species. The Noddy of Madagascar {A. rousseaui) is also considered by Mr. Hartert to 

 belong to the Pacific form, the oldest name for which appears to be Sterna pileata, 

 Scopoli. It is this form also which Mr. Anthony recently described as Anous ridgwayi 

 from Socorro Island, and Mr. Rothschild has kindly lent me several specimens from 

 Clipperton Island, Laysan, and the Carolines, all of which seem to belong to one and 

 the same species. 



Mr. Hartert* points out that the Pacific form of the Noddy has a longer and more 

 graduated tail than the true A. stolidus. The crown is greyer and never inclining to 

 white, as in the latter bird, and the general colour of the plumage is more sooty and 

 not so brown. On comparing the series of specimens lent by Mr. Rothschild, it 

 seems to me that these characters are recognizable, and I have therefore acknowledged 

 Anous pileatus as distinct from A. stolidus. 



Grayson met with the Pacific Noddy on Isabel Island, near San Blas^, and 

 Mr. Nelson observed it near the Tres Marias Islands ^^. Mr, Anthony obtained his 



