98 U.S. NATIONAL MUSEUM BULLETIN 221 



=Thalasseus bergii rectirostris (Peale). See Oberholser, Proc. U.S. Nat. 



Mus. 49:524, 1915. 

 15697. Immature female. Fiji Islands, Oceania. Original number 728. 



U.S. Exploring Expedition (1838-1842). 



Genus PROCELSTERNA Lafresnaye 



Procelsteriia saxatilis W. K. Fisher 

 Proc. U.S. Nat. Mus. 26: 559, 1903. 

 =Procelsterna cerulea saxatilis W. K. Fisher. See Peters, Checklist of 



birds of the world 2: 345, 1934. 

 188651. Adult male. Necker Island (lat. 23°35'24" N., long. 164°41' 

 W.), Hawaiian Islands, Oceania. May 31, 1902. Collected by Walter 

 K. Fisher. Received from the U.S. Fish Commission. 

 At the original description. No. 188651 is stated to be the "type," while 

 each of three other specimens is described as a "cotype." The word cotype, 

 as here used, must be considered equivalent to the modern paratype. 

 Megalopterus plumbea Peale 



U.S. Exploring Expedition 8 (Marara. and Orn.) : 285, "pi. Lxxvi," 

 1848. 

 =Procelsterna cerulea teretirostris (Lafresnaye) . See Mathews, Birds of 



Australia 2: 431, 1912. 

 131513=15467. Adult (sex not indicated). Honden Island=Pukapuka 

 Island (lat. 14°56' S., long. 138°48' W.), Tuamotu Islands, Oceania. 

 August 21, 1839. Original number 731. U.S. Exploring Expedition 

 (1838-1842). 

 Cassin's MS. list shows that he saw but three specimens, and there are 

 three entries in the museum register. Of these, No. 15466, said to come 

 from the Tuamotus, seems in fact to be an example of P. c. albivitta Bona- 

 parte and thus cannot be considered a cotype. No. 15463 is no longer in 

 Washington and is probably now in the Museum of Comparative Zoology 

 as their No. 75662. 



Genus ANOUS Stephens 



Anous f rater Coues 



Proc. Acad. Nat. Sci. Philadelphia for 1862, p. 558 (not earlier than 



December 30), 1862=1863. 

 =Anous stolidus pileatus (Scopoli). See Mathews, Birds of Australia 



2: 411, 1912; Peters, Checklist of birds of the world 2: 346, footnote, 



1934. 

 15517. Adult (sex not indicated). Bellingshausen Island (lat. 15^48' S., 



long. 154°30' W.), Society Islands, Oceania. Original number 729. 



U.S. Exploring Expedition (1838-1842). 

 15526. Adult male. Raraka Island (lat. 16°06'25" S., long. 144°57'40'' 



W.), Tuamotu Islands, Oceania. August 30 or 31, 1839. Original 



number 729. U.S. Exploring Expedition (1838-1842) . 



