38 
BULLETIN OF THE NUTT ALL 
This plumage is so well represented in the upper figure of Plate 
XXXIII of Xaumann’s Vogel Deutschlands^ that the illustration 
must have been taken from an exceedingly similar specimen ; the 
figure, however, represents a slightly darker bird, with a few spots 
on the breast and lesser wing-coverts. It is also very much like the 
young of Buteo borealis hrideri, as represented in Plate V, Pr. Ac. 
Nat. Sci. Philad., 1873, so far as regards the relative amount of 
brown and white ; but the markings are quite different, especially on 
the remiges and rectrices. 
Females. 
Light Phase, Adult (No. 56,107, Germany). Above grayish-brown, 
quite light on the tertials, some of the wing-coverts, and scapulars, which 
have still lighter (nearly white) borders ; all the feathers bordered with a 
paler, grayer shade, and showing distinct black shafts ; upper tail-coverts 
brown, narrowly tipped with soiled pale buff, the outer webs with a 
slight mottling of ochraceous. Tail grayish-brown narrowly tipped with 
dull buffy white, and crossed with nine or ten narrow bands of dusky, 
these mostly indistinct, but well defined on the inner webs of the interme- 
diae where the ground color is lighter and mixed with ochraceous. Head, 
neck, and breast light brown, the feathers edged with whitish, causing a 
slight streaked appearance ; flanks uniform brown, the feathers with nar- 
row whitish tips ; abdomen white, heavily spotted with dark brown ; this 
abdominal belt separated from the lighter and more uniform brown jugular 
patch by a somewhat crescentic pectoral belt of white nearly free from mark- 
ings ; tibiae nearly uniform brown, lighter in front and on the inside, the 
longer plumes tipped with light fulvous ; crissum immaculate white. 
Lining of the wing mixed rusty-rufous, buff and brown. Wing, 16.00 ; 
tail, 9.30. 
This specimen presents a curious and very strong resemblance 
to the adult Archibuteo lagopiis in the coloration of the lower parts, 
not only in the colors and markings but in the peculiar pattern. 
Dark Phase, Adult ? (No. 56,109, Germany), — • General color sooty-brov/n, 
this darkest on the head, neck, back, and breast (which have a decided 
purple reflection in certain lights), the general duskiness relieved only 
by rusty edges to the feathers ; scapulars “ spattered ” or blotched with 
pale cinnamon-rufous ; rump and upper tail-coverts uniform sooty-brown, 
the latter with very narrow^ and indistinct rusty tips. Tail grayish-brown, 
with narrow bands, of which about eight or nine are distinct, the inner 
webs of the middle pair much tinged with rufous. Abdomen marked 
with broad bars, or bands of dark brown and buffy- white, of about equal 
width ; the white bars most distinct and regular anteriorly, thereby throw- 
ing into greater relief the dusky pectoral patch, which has a convex poste- 
