246 STUDIES IN BIRD-MIGRATION 



ant everywhere at sea, singly and in pairs, between this 

 island and that of Lewis on 8th October 1910, and 12th 

 in 191 1. 



* PuFFiNUS GRisEUS, Sooty Shearwater. — One was seen 

 on the sea off the north-east side of St Kilda on 12th 

 September 19 10. On 8th October several came under 

 our notice off Boreray ; and others, thirteen in all, 

 between the St Kildan islands and the Flannan groups — 

 single birds, except a party of three. 



A bird of this species was seen off Boreray on 

 1 2th October 191 1, and several others during the voyage 

 to Lewis. It was one of the species which contested 

 with the Gannets, Gulls, Pomatorhine Skuas, Greater 

 Shearwaters, and Fulmars for the fish-offal cast out by 

 the cook of the trawler. In its eagerness to obtain 

 this food it plunged into the water, completely immersing 

 itself. 



This species does not appear to have been hitherto 

 recorded for Hebridean seas. 



PuFFiNUS ANGLORUM, Manx Shearwater. — This Is in 

 part the "Scraber" of Martin (see Black Guillemot), 

 who well describes its habits and affords some curious 

 information regarding them. Dixon (p. 94) says that as 

 many as four hundred have been captured on Soay 

 in a single night. Wiglesworth (p. 63) mentions that 

 it is still plentiful, but less so than formerly — a fact 

 which the natives attribute to its having been driven 

 out by the increase of the Puffin. Neil Ferguson tells 

 me that it breeds on Hirta, Soay, and Dun, but not on 

 Boreray. 



It is a summer visitor to the isles, and we only saw 

 one — namely, at sea when approaching the archipelago, on 

 I St September 19 10. 



