BLACK - THROATED DIVER 
271 
COLYMBUS GLACIALIS, Linn. GREAT 
NORTHERN DIVER. 
Manx, *Arrag-uooar or wooar (applied somewhat vaguely), see 
under 1 Cormorant.' 
During the winter months Divers are far from rare on 
the Manx coast, and the writer thinks that the present 
species is likely at least as abundant as the Eed-throated, 
but the examples are always or nearly always immature. 
Mr. Kermode thinks that Peel and Castletown Bays are 
specially frequented, and in the former Mr. Graves and 
I saw four as late as 5th May in 1901 ; another spent in 
Castletown Bay apparently the whole summer of 1903, and 
lingered (assuming the single bird seen to be always the 
same) to the spring of 1904. The former at least were not, 
however, in complete plumage, and Manx specimens are 
rarely obtained in that state, though Mrs. T. H. Kinvig has 
one such, and a second almost as good ; and a fine adult in 
Mr. Adams's hands in December 1896 showed traces of the 
bands on the neck. 
This species is pretty regularly, though not in general 
abundantly, met with each winter all round the coasts of 
the Irish Sea. It is common and well known about the 
outer isles of Scotland. 
COLYMBUS ARCTICUS, Linn. BLACK- 
THROATED DIVER. 
Mr. Kermode states that he has a male taken off the 
Vollan, Eamsey, 21st January 1886, and a female taken in 
Ramsey Harbour, February 1900. 
This is in the Irish Sea, as in general about Britain, the 
rarest of the Divers ; it has been met with in Louth and 
