GAVIiE. 



299 



298.[;STERNA':ALEUTICA. 



(ALEUTIAN TERN.) 

 Sterna aleutica, Baird, Trans. ChicagoJAcad. Nat. Sc. i. p. 321 (1869). 



The Aleutian Tern is about the size of the Common Tern (wing 

 from carpal joint 11 to 9 J inches). Its mantle and rump are slate- 

 grejj but its forehead and upper tail-coyerts are white. 



Figures : Baird, Trans. Chicago Acad. 1869, pi. 31. fig. 1. 



The Aleutian Tern appears to be a more or less accidental visitor 

 to the coasts of Japan, as there is an example in the Pryer collection 

 labelled " Inuboye,'^ which is probably the same as Cape Inoboga due 

 east of Tokio. 



It is a North Pacific species, breeding on the coasts of Alaska from 

 Kadiak to Norton Sound. 



299. STERNA' BERGII. 



(RUPPELL'S TERN.) 



Sterna hergii, Lichtenstein, Verz. Doubl.^ZooI. Mus. Berlin, p. 80 (1823). 



RiippeU's Tern is one of the larger species (wing from carpal joint 

 15 to 13 inches) .__ The black on the crown does not cover the fore- 



Head of sterna hergii. Natural size. 



head, and ends in a point on the nape, which is white, gradually 

 shading into slate-grey on the back. 



