BIRDS OF NORTH AMERICA. 745 
Be with variously colored ground, spotted and streaked with umber, 
rown, &f 33 by 2. ot 
Uria Troile, Bonap. Syn. p. 424, Rich. & Swain. ii 477. Nutt, ii. 526. Aud, iii. 
142 ; plate 218; Syn. p. 350. 
482. Uria Grylle, Linn. — Black Guillemot. 
Bill, black; feet, vermilion; upper parts, black, tinged with green ; 
lower parts, brown ; patch on each wing, white. Plumage, white in win- 
ter. Adult, 134, 214. Habitat, from New York north. Eggs, three, 23 
by 12, white, blotched with dark purple. ~ n 
Uria Grylle, Bonap. Syn. p.423.\ Nutt. ii. 523. ud. iii. 148 ; v. 627; plate 219; 
Syn. p. 350. Rich. & Swain. ii, 473. 
483. Uria Townsendii, Jud. — Slender-billed Guillemot. 
Bill and claws, black; feet, yellow; upper parts, brownish black ; 
feathers of back margined with light gray ; lower parts, band on nape and 
lower wing-coverts, grayish brown. Adult, 10. Habitat, coast near 
Columbia River. 
FAMILY VI.— COLYMBIDA, Vigors. 
GENUS I.—COLYMBUS, Linn.— DIVER, or LOON. 
484. Colymbus glacialis, Zynn.-—-Common Loon, Wilson, p. 648. 
Colymbus glacialis, Bonap. Syn. p. 420. Rich. §& Swain. ii, 474. Mult. ii, 513 
Aud. iv. 43; plate 306; Syz. p. 353. , 
485. Colymbus arcticus, Linn. — Black-throated Diver. 
Bill, black ; feet, grayish blue ; edge of tarsus, and part of webs, livid 
flesh color; fore part and sides of head, throat, and sides of neck, light 
bluish gray ; fore part and sides of head, darker ; upper parts, glossy bluish 
black, tinged with green anteriorly, and brown posteriorly ; two longitu- 
dinal bands of white bar; scapulars, marked with square white spots; 
“wing-coverts, with roundish spots of same; tail, blackish brown; fore 
neck, purplish black, ending with a transverse band of linear white spots; 
beyond the sides of neck, blackish brown, with longitudinal white streaks ; 
lower part of neck streaked with dusky and white; lower parts, pure 
white except a dusky band on sides. Male, 29, 394. Habitat, interior 
and along the coast. Eggs, three, 3 by 2, chocolate, tinged with olive and 
spotted with dark umber and black. — } 
Colymbus arcticus, Bonap. Syn. p. 420, Rich. & Swain. “Wi. 475. Nuit. ii 517. 
Aud, iv. 345; plate 346; Syn, p. 354. ; 
486. Colymbus septentrionalis, Zinn. — Red-throated Diver. 
Bill, bluish black ; feet, brownish black; anterior of tarsus and webs, 
flesh color ; fore part and sides of head, throat, and sides of neck, bluish 
gray ; fore part of neck, rich brownish red; hind part of head and neck, 
Jongitudinally streaked with greenish black and pure:white; upper parts, 
brownish black, tinged with green, mottled with .white; lower parts, 
white, excepting sides, where grayish brown is intermingled. “Male, 
19, 25. Female, 18, 24. Habitat, from Maryland north. Nests near 
edges of fresh water. Eggs, three, 3 by 1}, deep olive brown, marked 
with darker dull brown. * 
Colymbus septentrionalis, Bonap. Sum. p. 421. Rich. § Swain. ii. 476. Nutt, ii 
519. i= ia vy. 625; plate 202; Syn. p. 354. 
