NATATORES. 



391 



4. Genus INCA, Jardinc, Cont. to Orn. 1850, p. 32, 



1. Inca mystic ALT s, Jardine. 



Inca mi/sticnlis, Jardine, Cont. to Orn. 1850, p. 32. 

 Sterna inca, Lesson, Voy. Coquille, Zool. 1, p. 731 (1826). 



Yoy. Coquille, Zool. Atlas, Birds, Plate XLVII. 



Dr. Pickering observes of this bird : 

 This may, perhaps, belong to the Noddies, but it has little of the 

 habits and mode of flight of any of the Terns of the Atlantic coast of 

 the United States with which I am acquainted. There is little sail- 

 ing in its flight, but a rapid flexion of the wings, which are apparently 

 broader and shorter than in the Terns. This bird sometimes hovers 

 near the surface, and dives entirely under the water. Exceedingly 

 abundant in the harbor of Callao, and breeds abundantly on the Island 

 of San Lorenzo." 



5. Genus ANGUS, Stephens, Gen. Zool. XIII, p. 140 (1825). 

 1. Angus stolidus {Linn.). — The Noddy. The Noddy Tern, 



Sterna stolida, LiNN. Syst. Nat. I, p. 277 (1766). ) 

 Anous niger, Steph. Gen. Zool. XIII, p. 140 (1825). 



Catesby, Carolina, PI. LXXXVIII ; Aud. B. of Am. PI. CCLXXV ; 

 oct. ed. VII, PI. CCCCXL. Gould, B. of Aust. VII, PI. XXXIV. 



Numerous specimens, from the shores and islands of the Pacific 

 Ocean, present, with some degree of uniformity, small and apparently 

 unimportant differences from others from the Atlantic coast of the 

 continent of America. The bill appears to be larger in the latter, 

 and a slight dissimilarity is observable in the colors. On careful com- 

 parison, however, we are not inclined to regard the bird of the Pacific 

 as possessing characters sulTicient to justify a distinct specific designa- 

 tion, but venture to suggest that further examination of specimens, 



