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 Linneus. 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 form, with a white spot in the centre of the blue 
throat*. 
3. Sylvia wolfit of Meyer, with the entire throat blue +. 
So far as can be ascertained, the form met with in 
Great Britain has been No. 1, the true swecica, 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 1826 (red spot): Fox, 
Synops. Newcastle Mus. pp. 298, 309; Selby, Trans. Nat. 
Hist. Soc. Northumberland, 1831, p. 255, and Zoological 
Journal, vol. ii. 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. 
+ This is the rarest of the three in collections. It is said to be 
more common in Russia, and has been met with in Holland and in 
Spain. 
