GAVIM. 



299 



298. STERNA ALEUTICA. 

 (ALEUTIAN TERN.) 



Sterna aleutica, Baird, Trans. Cliicag'o Acad. Nat. Sc. i. p. 321 (1869). 



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

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

 grey, but its forehead and upper tail-coverts 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 herr/ii, Liclitenstein, Verz. Doubl. Zool. Mus. Berlin, p. 80 (1823). 



Riippell'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. 



