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THE WILLOW- WARBLER. 



Pliylloscopus trocliiliis (L.). 



This species arrived in great numbers along the whole of the 

 southern coast-line, from Cornwall to Essex, but the most 

 numerous records came from the St. Catherine's light, 

 Isle of Wight. 



The first arrival was noted in Gloucestershire on the 

 18th of March, and from that date until the 10th of April 

 stragglers were reported from most of the southern and 

 midland counties. 



The first immigratory movement of importance was noted 

 at St. Catherine's light, between 11.30 p.m. and 4 A.M., on the 

 night of the 10th of April. 



The main arrival of this species, however, began in the 

 west on the 17th of April, and from that date until about 

 the 12th of May Willow-Warblers continued to arrive in large 

 numbers along the whole of the south coast. By the end of 

 April they had reached Durham and Northumberland and 

 were generally distributed throughout the country. 



With such a continuous stream of arrivals it was difficult 

 to distinguish with certainty any special waves of immigra- 

 tion, but an increase was noted in Devon on the 18th, 20th, 

 23rd, 28th and 30th of April, as well as on the 2nd of May, 

 and in Hants on the 22nd, 23rd, 25th, 27th and 29th of 

 April, and on the 1st, 3rd and 8th of May, indicating, as in 

 the case of many other species, that there is a tendency for 

 the birds to arrive in Hants later than in Devon. 



The last record of an immigration from the lights came 

 from St. Catherine's on the 13th of May, but it seemed 

 probable from other observations that the birds continued to 



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