BIKDS. 205 



Juue and July, but it is not found ou auj- of tbe Aleutian cbain nor on the mainland north of the 

 Alaskan Mountains. From these mountains southward it is abundant, however, and its nest and 

 eggs have been obtained at Sitka. Its times of arrival and departure are unknown, and its biog- 

 raphy in this part of its range yet remains to be written. 



A comparison of specimens of this and of tbe other form from Northern Alaska and Eastern 

 N^orth America shows that the race pileolafa is based upon a general and constant intensity of 

 coloration. 



MoTACiLLA OCULAKIS Swiuh. Swiuhoe's Wagtail. 



Although this bird has been taken repeatedly at Plover Bay, Siberia, and thence throughout 

 a large portion of Xortheastern Asia, including China and Formosa, to the Lake Baikal region, it 

 appears to be almost unknown in Alaska. In fact its claim as a bird of the Territory rests upon 

 the capture of a single specimen, a young bird in summer plumage, by Captain Kellett and Lieu- 

 tenant Wood in " Northwest America," as recorded in the Brit. Mus. Cat. Birds, X, 473. 



The Wagtail seen by Jlr. Turner on Attn Island, ou the western extreme of the Aleutian chain, 

 may possibly have been of this species, but it is far more probable that it was the 21. lugcns which 

 Dr. Stejneger found common upon the Commander Islands. 



A single specimen of ocularis was taken by Mr. Belding at La Paz, Lower California, during 

 the winter of 1881-82. It is scarcely necessary to add that its occurrence at this point, so far 

 from its home, is entirely accidental. 



The western limit of this bird in Siberia is given by Seebohm as the water-shed between the 

 Yenesei and the Lena Rivers; thence east it has been taken in many portions of the continent, in- 

 cluding Mongolia, Chukchi laud, and the localities previously mentioned. 



A fine adult male secured by me June 26, 1881, at Plover Bay, Siberia, presents the following- 

 characters: The back is nearly uuiforaj ashy, changing on the upper tail-coverts to blackish, edged 

 with dark-ashy. All but the two outer feathers black. The two outer feathers are white with 

 their bases black and a narrowing longitudinal band of the same along the edge of the iuner web 

 of each, vanishing towards the end of the feather. A black line extends along and near tbe shaft 

 ou the outer web of the next to outer tail-feather, becoming broken and disappearing toward the 

 end of the feather. The wings are light-brown, but the tertiaries are much darker and edged with 

 white. The latter color so broadly edges the greater and lesser wing-coverts as to overlap and 

 conceal the dark-brown centers, and forms a large uniform jjatch on the upper surface of the wing. 

 A broad frontal patch of white extends from the bill back on the middle of crown to a line connect- 

 ing the posterior edge of orbits; this white is continued back nearly to the occiput as a superciliary 

 stripe. A narrow black line extends from the gape through the eye, uniting ou the back of the 

 neck with a nearly square black patch, which occupies tijc occipital and luichal area, and extends 

 partly down the sides of the neck. From the base of lower mandible ou either side a widening 

 band of white extends back under the eye, on the cheeks, and down the sides of the neck, separat- 

 ing the black crown patch from the large black area, which extends from base of under mandible 

 over the throat and breast. The rest of the under surface is dingy white with a wash of ashy on 

 the sides and flanks. Bill and feet black, iris dark hazel. Fall specimens exhibit a somewhat sim- 

 ilar pattern, with the black and white areas ou the hea<l and neck much broken up and intermixed. 



BuDYTES FLATUS LEUCOSTEiATrs (Hom.). Siberian Yellow Wagtail (Esk. Psu- 



(hi the west coast of Europe, and extending across the entire northern portion of the Old 

 World, is found a series of closely allied Wagtails, of which the form under consideration repre- 

 sents the easternmost. The literature bearing upon these birds is in a state of considerable 

 confusion, owing to the variability and close inter-relationship between the several varieties. 

 The Yellow Wagtail of Eastern Siberia, extending across Bering Sea into that portion of Alaska 

 in the region of Bering Strait, is one of the handsomest among its several related forms; and of 

 the several additions made to the North American fauna by the explorers of the Western Uniou 

 Telegraph Expedition, this was one of the most interesting. The first specimens were obtained 



