198 
COLYMBIDiE. 
June 1838), Mr. Hyndman observed one of these birds, perhaps 
the same individual, very near the shore here. The Rev. G. M. 
Black frequently sees the great northern diver, during winter, 
in the sea off Annalong, at the base of the mountains of Mourne. 
Some of the birds are in mature plumage. They appear to have 
favourite haunts, as he has observed what was believed to be the 
same bird, week after week in the same place. He has sometimes 
seen them take to wing. 
Mr. J. Y. Stewart, in his published list of the ‘ Birds, &c. of 
Donegal/ remarks : — “ From Colymbus glacialis and Immer being 
very common in this county, where they arrive the first week in 
October, I have had good opportunities of observing them. * * * 
I have every season been able to procure a number of both, and 
have thus been enabled to select for my museum an uninterrupted 
succession, proving, by almost imperceptible changes, the transi- 
tion from Immer to C. glacialis : the former of these, in the early 
part of their residence here, is much the more common, but to- 
wards the end of spring, when they leave this country, the num- 
ber of the latter is greatly increased, and though, even at that 
period, they have not attained the perfect plumage of that bird, 
yet, the completion of the white spots on the back, and the black 
bands on the neck, though not yet quite perfect, are sufficient to 
characterize the bird in such a manner that it cannot be mistaken. 
These birds appear to vary much in size and weight ; they gene- 
rally measure, from the tip of the beak to the end of the tail, two 
feet nine inches, and weigh about nine pounds ; but I lately got 
a specimen, in the plumage of Immer, measuring only two feet 
four inches, and weighing but six pounds ; and as I can perceive 
no difference in its bill from that of C. glacialis , I am forced, in 
following the indications of Temminck, to consider it as that bird, 
though its diminutive size would have led me to consider it as the 
young of C. arclicus , which I have not yet ascertained in this 
country. That these birds are well able to fly, I have had fre- 
quent proofs ; but not so as to their pedestrian capabilities. One 
which T got alive and uninjured, on being placed within a few 
yards of the water, when I was setting it at liberty, remained on 
