83 



THE WILLOW- WARBLEH. 



Phylloscopus trocJiilus (L.). 



The arrival of this species was recorded along the whole of 

 the south coast. Several were observed at the Scilly Islands 

 on the 11th of March^ evidently on passage, as their numbers 

 were reduced on the 13th^ while single birds were noted in 

 Sussex, Leicestershire and Devonshire on the 23rd, 26th and 

 28th respectively. 



Many were reported at Hanois light (Gruernsey) on the 

 night of the 2nd/3rd of April, but it was not until a week or 

 ten days later that Willow-Warblers really began to arrive 

 in any numbers in this country. From the 15th of April 

 onwards their arrival was practically continuous up to the 

 2nd of May, the most extensive immigrations taking place 

 between the 16th and 19th and the 28th and 30th of April. 

 By the end of the third week in April Willow- Warblers 

 were present in large numbers in most of the counties as 

 far north as Lancashire and Yorkshire, with stragglers in 

 Durham, Westmoreland and Cumberland. On the night of 

 the 22nd/23rd many were again reported at the Guernsey 

 light, but, like the previous record, the passage of these birds 

 does not coincide with those recorded at our own south 

 coast lights either in date or in the magnitude of the 

 migration. A second record on the 23rd/24th, however, 

 does coincide with one at St. Catherine's light, but it is 

 perhaps unwise at present to draw any conclusion from the 

 coincidence. 



The concluding augmentation of this prolonged wave, 

 mainly on the western half of the south coast, at the end of 

 April and beginning of May, together with a further large 



