GREAT NORTHERN DIVER. 
209 
struct their nests of sticks ; eggs of a sky blue colour. I in- 
spected a nest, which was not very large ; it contained two 
eggs and six young ones, the latter varying much in size ; they 
will occupy the same tree for a series of years. They com- 
monly sit on a stump, which rises out of the water, in the 
mornings of the spring, and spread their wings to the sun, 
from which circumstance they have obtained the appellation of 
sun birds. They are difficult to be shot when swimming, in 
consequence of only their heads being above the water.’’ 
Never having seen a specimen of the black-bellied darter of 
Senegal and Java, I cannot give an opinion touching its iden- 
tity with ours. 
GREAT NORTHERN DIVER, OR LOON COLYMBUS 
GLACIALIS Plate LXXIV. Fig. 3.* 
Colymbus glacialis, Linn. Syst. ed. 12, tom. i. p. 221, 5. — C. immer. Id. p. 222, 
No. 6- Ind. Orn. p. 799, 1. — C. immer. Id. p. 800, 2. — Le grand Plongeon, 
JBriss. vi. p. 105, pi. 10, fig. 1. — Le grand Plongeon tacbete. Id. p. 120, pi. 11, 
fig. 2. — Le grand Plongeon, Buff. Ois. viii. p. 251. — LTmbrim, on grand Plon- 
geon de la mer du nord. Id. p. 258, tab. 22. PI. Enl. 952. — Nortbei’n Diver, 
Lath. Gen. Syn. iii. p. 337 Imber Diver, Id. p. 340. Penn. Erit. Zool. 
No. 237, 238. Arct. Zool. No. 439,440. Bewick, ii. p. 168, 170. Montagu, 
Orn. Piet. Supp. App. Low, Fauna Orcadensis, p. 108, 110. — Plongeon Im- 
brim, Temm. Man. d' Orn. p. 910. Beale’s Museum, No. 3262, male and young ; 
3263, female. 
’ COLYMBUS GLACIALIS.— LmNMVS.j- 
Colymbus glacialis, Bonap. Synop. p. 420. Flem, Brit. Anim. p. 132. North. 
Zool. ii. p. 474. 
This bird in Pennsylvania is migratory. In the autumn it 
* This article is by Mr Ord. 
•j- The genus Colymbus, or the loons, have been restricted to those large divers, 
of which our present species will point out a good example. They are all birds 
of a large size, truly aquatic, are seldom on land except during incubation, and 
though endowed with a considerable power, seldom fly, unless very much pressed 
by necessity. The great northern diver is very frequent in the Frith of Forth, 
VOL. III. 
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