BIRDS OF NORTH AMERICA. 739 
444, Larus atricilla, Linn. — Black-headed Gull, Wilson, p. 652. 
Sane ate, Bonap. Syn. p. 359. Nutt. ii. 291. Aud. iv. 118; plate 314; Syn. 
p. 324, 
445. Larus Franklinii, Rich. — Franklin’s Rosy Gull. 
Bill and feet, vermilion; neck, rump, tail, and under plumage, white ; 
latter, tinged with red; black hood on nape; upper parts, bluish gray ; 
quills, terminated with white. Male, 17. Habitat, Fur Countries. 
Larus Franklinii, Rich. §& Swain. it. 424. Aud. v. 323; Syn. p. 325. 
446. Larus tridactylus, Linn. — Kittiwake Gull. 
Bill, greenish yellow; feet, black ; head, neck, rump, and lower parts, 
white ; back and upper surface of wings, grayish blue; tips of first five 
quills, black ; fifth, with a small white tip; tips of the others, white. 
Adult, 18, 363. Nests on ledges of rocks. Eggs, three, olive green, 
spotted with brown, 24 by 1}. ; : 
Larus tridactylus, Bonap. Syn. p. 359. Rich. § Swain. ii. 493. Nutt. ii. 298. Aud. 
iii. 186; plate 224; Syn. p. 326. 
447. Larus eburneus, Gmel.— Ivory Gull. 
Bill, yellow; feet, black; plumage, white. Adult, 14, 91. Habitat, 
accidental on the American coast. 
Larus eburneus, Bonap. Syn. E300 Rich. §& Swain. ii. 419. Nutt. ii. 301. Aud 
326. ; 
ili. 571; plate 287; Syn. p. 
448. Larus zonorhynchus, Rich. — Common American Gull. 
Bill, greenish yellow, with broad band of black; feet, greenish yellow 
plumage, white, excepting wings and back, which are light grayish blue, 
Adult, 20, 48. Habitat, throughout North America. Eggs, four, 22 by 18, 
dark cream color, blotched with different shades of purple, umber, and 
black. A 
Larus -canus, Rich. § Swain. ii. 420, Mutt. ii. 300. — Larus brachyrbynchus, Rich. 
& Swain. ii, 422, — Larus zonorhynchus, Rich. §& Swain. ii. 421. Aud. iii. 98 ; 
v. 638 ; plate 212; Syn. p. 327. 
449. Larus leucopterus, Fabr. — White-winged Silvery Gull. 
Bill, gamboge yellow, orange spot near end of lower mandible; feet, 
flesh color; plumage, white, except back and wings, which are ligh 
grayish blue. Adult, 26,50. Habitat, from New York to the Arctic Seas, 
Larus leucopterus, Bonap. Syn. p. 361. Rich. & Swain. ii. 418. Nutt. ii. 305. 
Aud. iii. 553; plate 272; Syn. p. 327. 
450. Larus occidentalis, 4ud.— Western Gull. : 
Bill, yellow, with orange red patch on lower mandible; feet, flesh 
color; head, neck, lower parts, rump, and tail, white; back and wings, 
grayish blue., Male, 27. 
Larus occidentalis, Aud. v. 320; Syn. p. 328. 
451. Larus argentatus, Brunnich.— Herring Gull. 
Bill, gamboge yellow, with orange red patch on lower mandible ; feet, 
flesh color; head, neck, lower parts, rump, and tail, white; back and 
wings, grayish blue ; tips of quills, white, or with white spots. Male, 23 
53. Habitat, along the whole coast. Nests on trees or on the ground. 
Eggs, three; 3 by 2; dull yellowish, blotched with umber. 
Larus argentatus, Bonap. Syn. p- 360. Mutt. ii. 304. Aud. ili. 588; v. 638; plate 
291; Syn. p. 828. 
