GREAT NORTHERN DIVER. 107 
markings were not so pure and distinct ; length, thirty-six 
inches, extent, forty-six. These birds frequent the ponds, 
rivers, and creeks during the summer ; build in the trees of 
the swamps, and those of the islands in the ponds ; they con- 
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 
commonly 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 
identity with ours. 
GREAT NORTHERN DIVER, OR LOON. 
(Colymbus glactalis.) 
PLATE LXXIV.—Fi«. 3.* 
Colymbus glacialis, Zinn. Syst. ed. 12, tom. i. p. 221, 5.—C. immer, Jd. p. 222, 
No. 6.—Ind. Orn. p. 799, 1.—C. immer, Jd. p. 800, 2.—Le Grand Plongeon, 
Briss. vi. p..105, pl. 10, fig. 1.—Le Grand Plongeon Tacheté, Jd. p. 120, pl. 11, 
fig. 2.—Le Grand Plongeon, Buff. Ois. viii. p. 251.—L’Imbrim, ou Grand Plon- 
geon de la Mer du Nord, Jd. p. 258, tab. 22.—Pl. enl. 952.—Northern Diver, 
Lath. Gen. Syn. iii. p. 357.—Imber Diver, Jd. p. 340.—Penn. Brit. Zool. 
No. 237, 238.—Arct. Zool. No. 489, 440.—Bewick, ii. p. 168, 170.—Montagu, 
Orn. Dict. Supp. App.—Low, Fauna Orcadensis, p. 108, 110.—Plongeon 
Imbrim, Temm. Man. d@ Orn. p. 910.—Peale’s Museum, No. 3262, male and 
young ; 3263, female. 
COLYMBUS GLACIALIS.—LInne&zvs.t 
Colymbus glacialis, Bonap. Synop. p. 420.—Flem. Brit. Anim. p. 132.—WNorth. 
Zool. ii. p. 474. 
Tris bird in Pennsylvania is migratory. In the autumn it 
makes its appearance with the various feathered tribes that 
* This article is by Mr Ord. 
+ The genus Colymbus, or the loons, have been restricted to those 
