354 
COLYMBIN-®. COLYMBUS. 
485. 2. Colymbus arcticus, Linn. Black-throated Diver. 
Plate CCII. Male, Female, and Young in winter. 
Adult in summer with the bill blacky the feet g’reyish-blue^ the an- 
terior edge of the tarsus^ upper surface of toes, and part of the webs, 
pale livid flesh-colour ; fore part and sides of head, throat, and sides 
of neck light bluish-grey, fore part and sides of head darker ; upper 
parts glossy bluish-black, tinged with green anteriorly, and shaded with 
brown posteriorly ; on the fore part of the back two longitudinal bands 
of transverse white bars, the feathers being tipped with that colour ; 
the scapulars, excepting the outer, marked in the same manner with 
transverse rows of rather large square spots ; most of the wing- 
coverts with two roundish spots of white near the end ; quills black- 
ish-brown, tinged with grey externally, paler on the inner webs ; tail 
blackish-brown, of eighteen feathers ; fore neck to the length of six 
and a half inches purplish-black, ending angularly below, and with a 
transverse interrupted band of linear- white spots near the upper part, 
beyond which the sides of the neck blackish-brown, with several lon- 
gitudinal white streaks, formed by the edges of the feather ; on the 
lower part of the neck a broad space occupied by their longitudinal 
dusky and white streaks : lower parts pure white, except a dusky 
longitudinal band on the sides under the wing. Young in winter with 
the bill bluish-grey, on the ridge dusky ; upper part of head and hind 
neck dark greyish-brown, sides of head greyish- white, minutely streak- 
ed with brown, sides of neck also streaked, its fore part faintly mot- 
tled; lower parts white, the sides and lower tail- coverts greyish-brown; 
upper parts blackish-brown, the feathers broadly edged with pale grey, 
quills and tail brownish-black, 
Male, 29, 39|. 
The young range throughout the interior and along the coast as far 
as Texas, in autumn and winter. Adult in full plumage very rare. 
Breeds in high latitudes. Columbia River. 
Colymbus arcticus, Bonap. Syn. p. 420. 
Colymbus arcticus, Black-throated Diver, Swains, & Rich. F. Bor. Amer. v. ii. 
p. 475. 
Black-throated Diver, Nutt. Man. v. ii. p. 517. 
Black-throated Diver, Colymbus arcticus, Aud. Orn. Biog. v. iv. p. 345. 
486. 3. Colymbus septentrionalis, Linn. Red-throated 
Diver. 
Plate CCII. Male in summer, Male in winter, Female, and Young. 
Adult, in summer, with the bill bluish-black, the feet brownish- 
black, anterior part of tarsus, upper surface of toes, and part of webs, 
livid flesh-colour ; fore part and sides of head, throat, and sides of 
neck, bluish -grey ; fore part of neck rich brownish-red ; hind part of 
