i86 THE SCOTTISH NATURALIST 



our Northern Isles, probably wintering birds of the Continental 

 T. ph. philomelies. From the night of 4/5th February till 24th 

 March there are many notes from our southern lanterns and 

 lighthouse stations of Thrushes sometimes in considerable numbers, 

 and from mainland stations of the return of the breeding birds. 

 These records probably all refer to our British Thrush, T. ph. clarkei, 

 though there may have been passage migrants of the Continental 

 form along with them. The largest arrivals reported are on d/yth 

 and i8th February, 6th, 9th, loth, i8th, 20th, and 24th March. 

 During the first ten days of March there are notes of emigrants in 

 very small numbers at Pentland Skerries, these being doubtless 

 T. ph. philomelus on its northward journey; but there is the same 

 absence of notes of spring emigration from our Northern Isles as in 

 the case of the Fieldfare : possibly the reasons suggested there may 

 also be applicable to this case. On 30th March we have this note 

 from the Butt of Lewis : " A Thrush that remained all winter has now 

 gone"; while on 30th April several arrived on the Isle of May, 

 and one was seen there on 3rd July, and one at Pentland Skerries 

 next day. 



On 9th September a Thrush appeared on the Isle of May, and 

 from that time to 4th October there are a good many notes from 

 our southern lighthouses and lanterns of small numbers on the 

 move : these were doubtless emigrant British Song-thrushes. A 

 Thrush is reported from North Unst on 15th September, and from 

 4th October to 2nd November many arrivals are recorded from 

 stations in Orkney and Shetland, this being evidently the autumn 

 immigration of the Continental T. ph. philomehts : records from the 

 Isle of May during this period may also refer to this form. During 

 October there are a good many records of Thrushes at the lanterns 

 of Little Ross and Killantringan ; and as birds sent in belonged to 

 the British form, a southward emigration of this race would appear 

 to have been in progress at the same time as the immigration of the 

 Continental birds took place. It is impossible to say to which form 

 the following notes refer. A few Thrushes at the Rhinns of Islay 

 lantern on 7th and nth November, some at the Skerryvore lantern 

 all night on 8th November, and several at the Butt of Lewis 

 on 28th November— this last and Thrushes at the Isle of May and 

 Little Ross on 17th November being evidently a weather movement. 

 During December there are frequent notes of one to three at 

 Pentland Skerries; a number visited the Isle of May on the 12th, 

 and a Thrush of the British race was killed at the Killantringan 

 lantern on the 14th December, and Thrushes visited the Little Ross 

 lantern on 5th, 28th, and 30th December. 



