446 DIOMEDEIDJJ. 



Nat. Mus. V. pp. 170, 173 (1882) ; Blakist. Amended List Birds 

 Jap. pp. 10, 35 (1884) ; Shufeldt, Auk, ii. p. 175 (1889). 

 Diomedea chinensis (nee Temin.), Rothsch. Avif. of Laysan, SfC. p. 55, 

 pis. (1893). 



Adult. Sooty-brown, darker on the nape, back of the neck, wings, 

 and tail ; a large triangular spot behind and below the eye, and the 

 feathers surrounding the base of the bill dirty-white ; front part of 

 the crown, sides of the head, neck, and abdomen paler sooty-brown ; 

 breast and flanks rather darker, lower abdomen white at the base 

 of the feathers ; tail white at the base ; under wing-coverts and 

 axillaries sooty-brown : bill dark reddish brown ; legs and feet 

 black. Total length about 28 inches, wing 18, tail 5-5, bill from 

 gape 4'6, tarsus 4-4, middle toe 4-3, outer toe 4-2, inner toe 3'8. 



Young ? Similar to the adult, but with the crown and sides of 

 the bead Avhiter, rump and upper tail-coverts white, or sooty-brown 

 mixed with white feathers. 



Hab. North Pacific Ocean. 



The specimens with white rump and upper tail-coverts have usually 

 been considered adult, but the specimens before me show that they 

 must be considered young. Some examples are in full moult, and 

 new dark feathers are appearing amongst the old and pale ones. 



Much confusion has arisen between this species and D. albatrus, 

 two very distinct birds, partly owing to the similarity between the 

 young of D. alhairus and the adiilt of D. nigripes. D'Aubentou's 

 rianche Enlumine, no. 963, upon which Temminck founded his 

 T). chinensis, and afterwards referred it to the young of his D. hra- 

 .chyura, certainly represents the young of D. albatrus, of which 

 D. bracliyura is a synonym. 



a. Juv. ? sk. At sea, N. Pacific Ocean, Salvin-Godman Coll. 



lat. 33°N., long. 119° \V. 

 [Capt. A. H. Markham). 



b. Ad. sk. N. Pacific Ocean. 



.c. c? ad.; d. $ ad.; At sea, N. Pacific Ocean, Voy. H.M.S. ' Chal- 



e, f. S jiv. ; g. April, June, July. lenger.' 

 5 juv. ? sk. 



h. Juv. ? sk. [N. Pacific Ocean.] Purchased. 



/. Ad. sk. Hakodatt5, Japan (ZTensow). Seebohm Coll. 



j. 2 ad. sk. Amoy, China, April 1861 Seebohm Coll. 

 (-R. Swinhoe). 



k. Skeleton. 



I, m. Skulls. 



7. Diomedea immutabilis. 



Diomedea exulans?, Kittl. Mus. Senckenh. i. p. 120 (1834). 



? Diomedea melanophrys, Bean, Pr. U.S. Nat. Mus. v. pp. 170, 173 



(1882). 

 Diomedea immutabilis, Rothsch. Bull. Brit. Orn. Club, i. p. xlviii 



(June 1893) ; id. Ibis, 1893, p. 448 ; id. op. cit. 1894, p. 548; id. 



Avif. of Laysan, ^c. p. 57, pis. (1893). 



Adult. Head, neck, rump, upper tail-coverts, and whole under 

 surface white, lores next the eye sooty-black ; back, wings, and end 

 of the tail dark sooty-brown, interscapular region paler, base of the 



