WARBLERS. 103 



treated as distinct species ; but it is questionable 

 whether they should not all be regarded as one and 

 the same species in different phases of plumage. The 

 three forms are : — 



1 . Motacilla suecica of Linnseus. The eastern and north- 

 ern form, with a red spot in the centre of the blue 

 throat. 



2. Sylvia leucocyanea of Brehm. The western and south- 

 ern fornij with a white spot in the centre of the blue 

 throat*. 



3. Sylvia wolfii of Meyer, with the entire throat blue f. 



So far as can be ascertained, the form met with in 

 Great Britain has been No. 1, the true suecica, al- 

 though in one instance, that recorded by Captain 

 Hadfield, a white-spotted bird is stated to have been 

 met with in the Isle of Wight. The following in- 

 stances of the occurrence of Blue-throated Warblers 

 in England are on record : — 



One, Newcastle Town Moor, May 1836 (red spot) : Fox, 



Synops. Newcastle Mus. pp. 298, 309 ; Selby, Trans. Nat. 



Hist. Soc. Northumberland, 1831, p. 255, and Zoological 



Journal, vol. iii. p. 497. 

 One, Devonshire, doubtful : M. C. Cooke, Naturalist, vol. iii. 



(1853), p. 203. 

 One near Birmingham: Yarrell, Hist. Brit. Birds, vol. i. 



p. 265. 



* This is the ordinary Dutch and German form. 



t This is the rarest of the three in collections. It is said to be 

 more common in Eussia, and has been met with in Holland and in 

 Spain. 



