DIRECTOHV TO IJIJiDS OF KASTEKN NOKTU AMEKICA. 



17 



1. RAZOR-BILLED AUK, A. torda. 15.00 lon^: black 

 above; white beneath; narrow white wing band; brownish on 

 head, neck, and throat, fig. 12. In Fig. 12. 



winter the throat is white. Young 

 have a smaller bill without grooves 

 or bands. Nests in cavities about 

 rocks ; eggs, 1,2, white, heavily mot" 

 tied with brown and umber. Breeds 

 the last week in June. A trim, neat, 

 bird, rather unsocial, and quite 

 quarrelsome. Occurs in summer 

 from Grand Menan northward ; mi- 

 grates south late in Oct. ; winters 

 from Mass. to N. J. ; goes north in 

 early March. This species holds its 

 tail upright when swimming. Cries, 

 loud and harsh. 



b. Murres. Uria. 



Differ from a in being more slender, with a pointed bi-l 

 which is not much compressed nor at all ridged, figs. 13, 14. 

 Colors, brownish or black above : white beneath ; wing band, 



Fis. 13. 



O, A, a. 1. 1-8. 



O, A. b, 1. 



much as in a, 1. Downy young, blackish, 



sprinkled with yellowish. Eggs, 1, pyri- 



f orm, greenish or white, spotted, dotted, and lined with black , 



placed on shelves of rocky cliffs. The birds when on land sit on 



