334 



SYLVIAD^. 



parent birds in the colour of their plumage ; but in the 

 autumn after their first moult the whole of the under 

 surface of the body is more decidedly yellow than the 

 same parts in the parent birds at the same season, and this 

 yellow colour is retained to some extent till after their 

 re-appearance here in the following spring, so that it is 

 not difficult to select the birds of the previous year from 

 those which are older. 



The vignette below represents the nest of the Wood 

 Warbler, which resembles also that of the Willow War- 

 bler, but there is this distinction in the materials, which is, 

 I believe, constant ; I have never seen a nest of the Wood 

 Warbler with any feathers in it, or the nest of the Willow 

 Warbler without feathers. 



