10 BRITISH BIRDS. 



near Axwell Park, co. Durham, iii May, 1904. In a 

 discussion. Dr. Sclater said " that he saw no reason why 

 the bird should not reach England as an accidental 

 autumn visitor," but it will be remembered that this 

 occurrence was in May. As I decline to believe that a 

 Warbler can cross more than three thousand miles of ocean 

 without food or human aid, I do not add it to the 

 British List.] 



yil. — The Grey-headed Wagtail. 

 Motacilla viridis, Gm. ; M. horeaUs, Sundev. 



In deference to the opinion of the majority that this, and 

 the species next in order can be specificall}- and consistently 

 distinguished from M. fiava, I include them here. 



Males of M. viridis, the Scandinavian form, with dark 

 grey crown and no white eye-streak, w^ere obtained years 

 ago near Penzance, as mentioned in my Manual (p. 128). 

 In the spring of 1901 one was captured near Halifax, and 

 on May 13th, 1903, two were shot near Willingdon, Sussex ; 

 all these birds being subsequently exhibited (Bidl., XIII., 

 pp. 68-69). At a meeting of the B.O.C. (Bull., XIX., 

 p. 23), Mr. P. F. Bunyard (introduced by Mr. H. E. 

 Dresser) exhibited a pair and their eggs, obtained on 20th 

 June, 1906, in a marsh between Rye and Lydd. 



This form ranges eastward through Siberia to the 

 Chukchi Peninsula. 



VIII. — The Black-headed Wagtail. 

 Motacilla melanocephala, Licht. {M. feldeggi, Michahelles) . 



Under the latter name Mr. W. R. Butterfield exhibited 

 " a male in fine plumage," shot near Willingdon, on 

 May 13th, 1906 (Bull., XIII, p. 69). 



This form inhabits South-eastern Euroj)e, but complica- 

 tions with M. imradoxa, etc., begin — though they do not 

 end — at Hungary. 



