72 , BRITISH BIRDS. [vol. xm. 



took place in the forenoon. On the afternoon of the 20th a 

 single bird was seen in the fields. 



The Pied Wagtail {Motacilla alba lugubris). 



Four light records : January iSth'igth, 1912, a few ; 

 October i5th/i6th, 1911, one ; September 3rd '4th, a few, 

 and 5th /6th, one, 1913. 



Probably a regular double-passage migrant and almost 

 certainly so in autumn, but chiefly diurnal, so that, with the 

 other Wagtails and Pipits, the light records do not convey a 

 correct idea of its status. 



As a summer resident apparently represented by a single 

 pair. Doubtfully recorded (probably owing to omission to 

 make a note at the time) by Mr. Aplin. Old and young seen 

 by Mr. Coward. 



In 1913 the single pair was seen almost daily and were 

 watched to their nest on June 20th. It was situated on a 

 small projecting rock under an overhanging gorse tump half 

 way up the mountain side above the farms, and contained 

 fuUy fledged young. 



In September 1913 its migratory movements were those 

 detailed below under the next form, the two races often 

 travelling in company. On the whole, however, the White 

 Wagtail was in larger numbers, particularly on those days 

 when the movements were heaviest. 



The White Wagtail {Motacilla alba alba). 



Twice recorded at the light, viz : September 9th'ioth, 

 1910, and September 3rd/4th, 1913. Without doubt a 

 regular passage migrant, at any rate in autumn, but chiefly 

 diurnal. In spring it has been recorded as a regular migrant 

 from the Merioneth and Anglesey coasts. 



The movements of this bird and the Pied Wagtail were one 

 of the chief migratory features of vSeptember 1913, and were 

 almost always performed in company. From the 3rd to the 

 5th about forty birds were present on the island, and probably 

 comprised both forms, but this is not certain. The summer 

 residents and their young were either mixed Mith these or 

 had already gone. 



A movement recorded at the lantern on the night of the 

 3rd /4th caused no appreciable change in their numbers, but 

 following another on the 5th/6th, only quite a few birds 

 were left and all had gone by the 9th. On the loth, nth, 

 I2th, 14th, 15th, 19th and 21st, single birds, and small 

 numbers up to eight were seen passing on the routes about 



