THE BIRDS OF FAIR ISLE 137 



are in Burmah, India, South China, and Borneo. This 

 eastern bird resembles our Grasshopper- Warbler, but, 

 as a rule, it is a little smaller, and has the dark spots on 

 the centre of the feathers of the upper plumage more 

 clearly defined. The Orkney specimen, which is a bird 

 of the year, has the under parts greyish yellow, with 

 dark brown streaks on the centre of the feathers of the 

 throat and breast. 



TuRDUs viscivoRUS, Mistk-Thrush. — A few appear 

 on both the spring and autumn passage movements to and 

 from Northern Europe. In spring it has been observed 

 between 6th March and 12th May; and its autumn 

 visits date from ist October to 20th November, but at 

 this season it is chiefly observed during the latter half of 

 October. Usually only one or two birds are observed 

 on each occasion, but most probably a number escape 

 notice, as the bird chiefly frequents high ground in the 

 more remote portions of thie island. 



TuRDUS MUSicus, Song-Tkrush. — Birds belonging to 

 the Continental race (the typical Turdus musicus) occur 

 on both passages in considerable numbers, and a few of 

 those arriving in the autumn pass the winter on the isle. 



The spring movements northwards commence on the 

 part of a few birds late in March (22nd earliest) ; but their 

 arrival in numbers takes place from the end of the first 

 week of April to that of May. Later, stragglers or small 

 numbers occur, and have been recorded down to 8th June. 



In autumn the first immigrants usually appear in 

 mid- September, but there are no great arrivals until the 

 second week of October, and these are witnessed at 

 intervals until 21st November. At this season the 

 turnips are the main resort of the immigrant Thrushes, 

 but many resort to the face of the cliffs. 



