VOL. VI.] STUDIES IN BIRD MIGRATION. 85 



During these tv.o visits he was able just to double the knoAvn 

 avifauna of the island, and out of ninety-six species Avhich 

 came vinder observation, sixt^^-two Mere migrant-visitors and 

 fourteen mere waifs ; one new British bird, the American 

 Water-Pipit, and two neAv Scotch birds,, the Marsh-Warbler 

 and Baird's Sandpiper, were obtained. The diary of daily 

 observations in 1910 and a full list of St. Kildan birds are 

 added, with several good photographs of the island, and a 

 complete ornithological biljliography. Hitherto vmrecorded 

 from the Outer Hebrides we find occurrences of the following 

 species : Black -throated Wheatear (1), Wr^Tieck (1), Great 

 Snipe (1), Sooty Shearwater (several). Scarlet Grosbeak (3), 

 Little Bunting (2), Red-throated Pipit (2), and Northern 

 Chiflfchaff (1), while additional records of such rarities as 

 Greenland Redpoll, Turtle-Dove (1), Barred Warbler (1), 

 Lesser W^hitethroat (4), and Garden-Warbler (several) are 

 of interest, and the White Wagtail is considered a common 

 migrant. 



Perhaps one of the most forlorn, wild, and desolate spots 

 to the ordinary man, is the little group of uninhabited islets 

 kno\vii as the Flannans or Seven Hunters, situated in the 

 Atlantic about twenty miles west of Lewis. To the ornith- 

 ologist, however, they are of considerable interest, so much 

 so that ^Ir. Clarke having received interesting migration- 

 schedules from the lighthouse keeper for a number of years, 

 was induced to spend a fortnight on the largest grass -covered 

 island. The results of these combined observations has 

 enabled him to enumerate no less than one hundred and 

 fifteen species as having occurred there, mostly migrants, 

 and he gives us a full list oi species and data. Evidently these 

 islands catch the fringe of the west coast passage-movements, 

 besides being sometimes visited by cold-driven birds in 

 winter. Several unexpected rarities have been obtained, 

 such as the Short-toed Lark, Eastern Sky-Lark, Two-barred 

 Crossbill and the Pratincole (in July !), while the Tree-Pipit, 

 Pied Flycatcher, Red-backed Shrike, and Dotterel have been 

 added to the Outer Hebridean fauna. The Goldcrest appears 

 to be an uncommon migrant at any of the Avestern isles. 



From the Flannans Mr. Clarke paid a flying visit to Sule 

 Skerry, a small islet .35 miles north-west of Hoy Head, Orkney, 

 and the results of his visit and the observations of Mr. Tomison 

 (the light-keeper) over a number of years are embodied in a 

 short chapter. The west coast stream of migrants to and 

 from the north via Shetland apparently im.pinges upon this 

 lonely spot, and one hundred and three species have been 

 recorded, of which JMr. Clarke gives the details ; amongst them 



