140 STUDIES IN BIRD-MIGRATION 



is a regular visitor on both the seasonal passages, and is 

 not at all uncommon. 



The earliest date on which it has appeared in spring 

 is 1 8th March, but the next earliest record is not 

 chronicled until 8th April. It has not been seen in 

 numbers before 23rd April, nor after 17th May, but 

 stragglers occur down to the 21st. Exceptionally it has 

 been observed as late as 15th June. 



The average date for its return is 28th September, 

 (earliest the 23rd, latest 5th October). In some seasons 

 it is numerous during the first half of October, but 

 is not usually so until the i8th and after; and the 

 passages have been observed down to 2nd November, 

 but a single bird was seen on the 27th in 1910. 



During its sojourn it frequents the faces of the cliffs 

 and chasms, also the stone walls of the higher and 

 more remote parts of the isle. 



Erithacus rubecula. Redbreast. — The Continental 

 race of the Redbreast is a common and regular visitor 

 throughout its spring and autumn movements to and from 

 its North-Western European summer haunts. A few of 

 the autumn migrants pass the winter in the isle. 



The spring passage commences during the second 

 week of April, and laggard migrants have occurred 

 as late as 23rd May. The main period for the vernal 

 movements is between the second week of April and 

 the end of the first week of May. A single bird was 

 observed on 9th June 19 10, and several were seen on 

 loth March 1908.. 



The dates of first appearance in the autumn range 

 from 20th to 26th September. It is numerous from i8th 

 October to 8th November, and smaller numbers arrive 

 down to the 24th. 



