COLYMBINiE. COLYMBUS. 
353 
rounded of more than twelve feathers. Tongue long, tri- 
gonal, tapering ; oesophagus very wide ; proventriculus ex- 
tremely dilated; stomach rather large, roundish, a little 
compressed, moderately muscular, with a rather thick, dense, 
longitudinally rugous epithelium ; intestine rather long and 
wide ; cceca rather long and wide ; cloaca globular. 
484. 1. Colymbus glacialis, Linn. Great Northern Diver. 
— Loon, 
Plate CCCVI. Male, and Young in winter. 
Adult in summer -with the bill black, the feet livid greyish-blue, 
their inner sides tinged with flesh-colour ; head and neck dark green- 
ish-blue with purple gloss ; on the throat a small transverse patch of 
white longitudinally streaked with dusky ; above the middle of the 
neck two large patches of white similarly streaked, separated in front 
to the distance of an inch, but almost continuous behind ; lower parts 
glossy white, excepting the feathers on the sides under the wings, 
which are black, each with two, three, or four elliptical white spots, a 
faint dusky baud across the vent, the lower tail-coverts, which are 
brownish-black tipped with white, and the axillar-feathers and large 
wing-coverts, which have a dusky streak along the middle ; sides of 
the neck at its lower part longitudinally streaked with black and 
white ; upper parts glossy black, variegated with spots of white in re- 
gular transverse slightly curved lines, having the convexity backwards, 
the spots small and roundish towards the neck and sides, larger and 
somewhat four-sided along the middle of the back, largest and rec- 
tangular on the scapulars, very small and roundish on the hind part 
of the back and tail-coverts ; upper part of wing similar, with smallish 
spots ; alula and quills brownish-black, a few of the inner secondaries 
only having two white spots at the end of the tail brownish-black, of 
twenty feathers. Young in winter with the bill pale yellowish-green, 
the ridge and tip of the upper mandible dusky ; upper parts dark 
greyish-brown, each feather margined with lighter, lower parts white, 
sides of the neck below streaked with dusky, sides of body dusky, 
without spots. 
Adult, 82|, 572« Young Male, in winter, 81 i, 544. 
During winter dispersed over the United States, in Texas, as well 
as along the coasts of the Atlantic, and the north-west. Breeds from 
Massachusetts northward to very high latitudes. Common. 
Great Northern Diver or Loon, WiLS. Amer. Orn. v. ix. 
Colymbus glacialis, Bonap. Syn. p. 420. 
Colymbus glacialis. Great Northern Diver, Swains. & Rich. F. Bor. Amer. v. ii, 
p. 474. 
Loon or Great Northern Diver, Nutt. Man. v. ii. p. 513. 
Great Northern Diver or Loon, Colymbus glacialis, Aud. Orn. Biog. v. iv. p. 43, 
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