494 



THE DIVING BIRDS — PYGOPODES. 



Four eggs, selected by Dr. Bryant as characteristic of their general size and shape, 

 measure 2.24 by 1.42 inches; 2.10 by 1.50; 2.01 by 1.46; 2.28 by 1.51. 



The Smithsonian Institution has eggs of this species from the Bay of Fundy, Gulf 

 of St. Lawrence, and Newfoundland. In some the ground-color is a glaucous-white; 

 in others a deep buff; the markings are of a rich brown intensified into blackness. 

 Their average size is 2.30 by 1.85 inches. 



Cepphus columba. 



THE PIGEON GUILLEMOT. 



Uria grylle, /S, Lath. Ind. Orn. II. 1700, 707. 



Cepphus columba, Pali,. Zoog. Hosso-As. II. 18-26, 34S (part). 



Vri.i columba, Keys. & I'.i.as. Wirb. Eur. 1840, p. xcii. — Cass. V. S. Expl. Exp. Orn. 185S, 346, pi. 



38, fig. 1 ; in Baird's I!. X. Am. 1858, 012 ; ed. 1860, pi. 96, tig. 1. — Baird, Cat. N. Am. B. 



1859, no. 727. — Coijes, Key, 1872, 345; Check List, 1873, no. 632; 2d ed. 18S2, no. S72. — 



Ridgw. Num. N. Am. I',. 1881, no. 761. 



Hah. Coasts and islands of the North Pacific, from Southern California (breeding) to Aleutian 

 Islands, and across to Kamtschatka; thence southward to Northern Japan. Wholly replaced north 

 of Behring's Straits by ft Mandtii. 



C. colum&a, summer dress. 



Sp. Char. Similar to C. grylle, but the bill stouter and more obtuse at the tip, the under 

 surface of the wings without any distinct white, and with the white patch on outer surface of the 



Downy young. 



Suininrr ,i:/i'//. 



wings divided for the lower half by a Mark V-shaped bar. Adult, hi summer: Uniform sooty 

 slate-black, slightly glossed with "invisible" green ; wing with two white patches, one covering 



