322 STUDIES IN lilllD-MIGRATION 



species moving south during the mornings of 25th and 

 27th September. 



Sterna macrura, Arctic Tern. — I saw two close to 

 the tower at 9.30 a.m. on 12th October; they were in 

 immature plumage, but were not birds of the year 

 (see p. 301). 



Sterna fluviatilis, Common Tern. — A few appeared 

 and remained for some time off the reefs, on 22nd, 27th, 

 and 28th September. I saw one alight on a nasty cross 

 sea, amid which it washed and preened its feathers in 

 the most unconcerned fashion. 



Xema sabini, Sabine s Gull. — As already related, 

 an adult assuming winter plumage appeared at 9 a.m. on 

 29th September, and remained some time in the vicinity 

 of the tower, affording ample opportunities of observing 

 it, both on the water and on the wing. 



Megalestris catarrh actes, Great Skua. — I 

 observed this bird on three occasions during my 

 residence in the lighthouse. During a moderate gale 

 on 22nd September, three appeared in company and 

 came close to the tower on several occasions. On 

 I St October one flew past to the south-west, and on the 

 1 6th another single bird was seen. 



Stercorarius roMATORiiiNUS, Pomatorhine Skua. — 

 From 19th September to the day of my departure, 19th 

 October, this species was constantly present, in great 

 numbers, in the vicinity of the Eddystone. 



Stercorarius crepidatus, Arctic Skua. — Appeared 

 with the last-named species on 19th September, and was 

 present when I left. It was fairly common, but not so 

 numerous as S. pomatorhinus. 



PuFFiNus gravis. Great Shearivater. — Seen almost 

 daily, sometimes in considerable numbers, from 19th 



