214 STUDIES IN BIRD-MIGRATION 



* Sylvia borin, Garden- Warbler. — This species 

 was observed in small numbers on passage from 

 2nd to 2ist September 1910. During this period it 

 came under notice on seven days, and was especially 

 in evidence, like the Willow - Warbler and other 

 migrants, on the 6th. These migrants frequented 

 the undercliff fringing the beach, the crofts, and 

 the detached enclosures in which grass is grown. 

 Here they were usually to be seen clinging to the 

 heads of the cow-parsnips, which flourished exceedingly 

 on the island, and harboured an abundance of insect 

 food. 



Sylvia subalpina, Subalpine Warbler. — One was 

 observed on 13th June 1894, and was shot on the 

 following day in the Manse garden by Steele Elliot 

 (p. 95). The sex of the specimen is said not to have 

 been determinable. A gale of wind had been blowing 

 from the south-west on the day previous to its 

 appearance. 



* Phylloscopus trochilus, Willow- Warbler. — This 

 was one of the most frequent visitors that came under 

 our notice, being observed on no fewer than fourteen 

 days between ist and 26th September 19 10. These 

 birds usually appeared in small numbers, but on the 6th 

 they were fairly numerous. They were found chiefly in 

 the crofts and the detached enclosures, where they 

 sought for insects on the cow-parsnips and other weeds 

 which flourished among the grass. In 1911 one was 

 observed as late as 6th October. 



Phylloscopus collybita, Chiffckaff. — Several were 

 seen in the crofts on 6th September 19 10, and another 

 was observed and obtained on the 12th of the same 

 month. A single bird was obtained on the nth of 



