20 U.S. NATIONAL MUSEUM BULLETIN 221 



pairs ... we saw but about a dozen with the pure white plumage . . ." 

 In short, it appears that specimens were taken only on Honden and Wake 



Islands and, if we consider Peale's description of the immature plumages 



too cursory to warrant inclusion of the young among the cotypes, that we 



are probably justified in accepting as the type No. 15611 from Wake Island, 



the only specimen in full white plumage. 



A mere fragment of the original label of No. 15611 remains; the sex is 



known only by the description of it by Baird, Brewer, and Ridgway {loc. 



cit.) as "Adult male, perfect plumage." 



Sula brewsteri Goss 



Auk 5 (3): 242, July 1888. 

 =Sula leucogaster brewsteri Goss. See Peters, Checklist of birds of the 

 world 1:85, 1931. 



113436. Adult male. San Pedro Martir Island, Gulf of California ("a 

 little north of latitude 28°, and not far from midway between shores"), 

 Mexico. March 21, 1888. Collected by Nathaniel S. Goss. 



113437. Adult female. Same data as No. 113436. 



Family PHALACROCORACIDAE: Cormorants 

 Genus PHALACROCORAX Brisson 

 Phalacrocorax dilophus albocilialus Ridgway 

 Proc. Biol. Soc. Washington 2: 94, April 10, 1884. 

 =Phalacrocorax auritus albociliatus Ridgway. See Grinnell, Univ. Cali- 

 fornia Publ. Zool. 38: 263, 1932. 

 82432. Adult male in nuptial plumage. Cedros Island (lat. 28°10' N.), 

 in the eastern Pacific Ocean off the State of Baja California, Mexico. 

 Entered into the museum register on July 6, 1881. Collected by Lyman 

 Belding. 

 Baird, Brewer, and Ridgway (Water birds of North America 2:152, 

 1884) show that no less than 12 specimens from the "coast of California 

 and Lower California" were available to Ridgway, but we cannot prove that 

 all were in the national collection. It is still possible, however, to bring 

 together six specimens of the original series of 1884; their proveniences are 

 the Farallon Islands (2), Cedros Island (1), Cape San Lucas (2), and the 

 Revilla Gigedo Islands (1). Of the six, but one, the bird from Cedros 

 Island, bears fully developed nuptial plumes and thus really agrees with 

 Ridgway's diagnosis. 



The A.O.U. Checklist Committee in 1910 restricted the type locality to 

 the Farallon Islands. Nos. 13733 and 17396 are from the Farallones and, 

 so far as we now know, the only ones Ridgway had seen from there. While 

 each shows just enough development of white filaments on head and neck 

 to justify his having included them in his albociliatus, the plumes mentioned 

 as principal character of the race are wholly absent, and it is therefore highly 

 improbable that he would have selected either of them to represent the type. 



