500 



THE DIVING BIRDS — PYGOPODES. 



Lining of the wing deep smoky gray. Bill uniform black, the extreme tip a little paler ; iris dark 

 brown ; legs and feet pale colored in the dried skin (flesh-color in life 2 ), the webs and claws dusky. 

 Midsumm r plumage: Similar to the above, but more uniformly dusky, the rusty bars of the rump, 

 etc., wanting, owing to abrasion of the tips of the feathers. Winter plumage (= B. H'rangeli, 



Summer plumage. 



Brandt) : Above, dusky, interrupted by a narrow white band across the upper part of the nape ; 

 interscapulars, feathers of the rump, and upper tail-coverts tipped with plumbeous ; scapulars 



chiefly white, especially the inner ones, forming a conspicuous longitudinal patch on each side of 

 the back. Entire lower parts, including the lower half of the lores and the whole side of the head, 

 except the orbital region, pure white, the exterior feathers of the sides and flanks striped with 



Winter plumage. 



plumbeous or dusky grayish. Lining of the wing smoky gray, as in the summer plumage. Young, 

 first plumage: Above, uniform blackish (without plumbeous tips to anj r of the feathers), the 

 occipital band of the winter plumage slightly indicated or interrupted ; scapular patch less distinct 

 than in the winter plumage. Lores almost, wholly dusky. Lower parts white nearly everywhere, 

 but more especially on the jugulum, breast, and sides, transversely mottled with fuliginous-dusky. 

 Bill much smaller and weaker than in the adult. 



Total length, about 9.50 to 10.00 inches ; extent, 18.00; wing, 5.00 ; culmen, .60-70; tarsus, 

 .70 ; middle toe, without claw, .90-1.00. 



This also is an oceanic and a Pacific species, occurring from the coast of California 

 northward. To what extent this bird is to be found on the opposite coasts of Asia, 



1 According to Audubon (1. c.) the feet are yellow. 



