LARID^— THE GULLS AND TER.VS. 225 



The great Burgomaster Gull is an Arctic spenies which occa- 

 sionally visits Lake ^lichigan in winter. It is the largest of 

 the gulls, excepting only the Black-backed Gull, or "Saddle- 

 back" (Z. marimis). 



In Greenland, where it is almost a resident species, a few in- 

 dividuals (chiefly young birds) being seen in the very coldest 

 weather, it is said to pirate upon the eiders {Somateria mollis- 

 sima hovcalis), often compelling them to surrender the mussels 

 which they have brought up from the bottom of the bays or 

 fiords. There, "the principal breeding place of this gull in the 

 vicinity of Ivigtut is close by the open sea, near the mouth of 

 the fiord, where they congregate in considerable numbers. In 

 August the 3'oung birds assemble in the fiord, especially near 

 the narrow channels, as at Karsuk and Ellerslie, and feed dur- 

 ing that month and the next on the berries of Enipdrum ni- 

 grum. At that season they are easily shot, and their flesh is of 

 a very savory flavor. The breasts of the young of all species 

 of gull are eaten here as a delicacy." * 



Larus leucopterus Faber. 



ICELAND GULL. 



Popolar synonym. White-winged Gull. 



Larus araentatus Sabine, Trans. Linn. Soc. xii, 1818. 5(6 (not of BrOnn. 1761). 



Larus leiicoplerun Fabeb, Prodr.Isl. Orn. 1S22, 91.— Sw. &UiCH. F. B.-.\. ii, 1831, JI8.— NuiT. 



Man. ii, 18SI, S'l.'..— AUD. Orn. Biog. iii, 1835, 553. pi. 3S2; Synop 1839, 327; B. Am. vii,18U. 



159, pi. 417.— Lawr. in Baird's B. N. Am. l*-.8, 813— Baibd, Cat. N. Am. B. 18.59, No. 658. 



—CouES.Koy, 1872, 311; Olie-k List. 1873, No. 511; 2d o;l. 1882. No. 769; B. N. W. 1871. 



622.— BiDOW. Nom. N. Am. B. 1881, No. 661; Mon. N. Am. B. 1887. 36.-B. B. & B. Water 



B. N. Am. ii, 18SI. 216.— A, O. U. Chock List, 1886, No. 13. 

 Larus arclicus Macoill. M<?tt.. Worn. Soe. v, 1824, '.:68. 

 Larus glaucoides "Temm." JlEXEB.Taschenb. Vog. Deutsclil. iv, 1822, 197.— Temm. PI. Col. 77<! 



livr. Inlrod. Larus, 1828. 

 Larus islandicis Edmonst. )Iem. Wern, Soc. Iv, 1823, .506 (noo op. cil. p. \a:,=L. olaucus). 

 Larus minor Bbehm, Vok. Doulschl. 1831, 736. 

 Laroides subleucoplerus Bbebm. t c. 746. 

 Larus (Glaucus) glacialis Bbdch. J. f. 0. 1S53. 101 (noo Macolli.. 1821). 



Hab. Range about the same as that of L. glaucus. South in winter to coast of Massa- 

 chusetts and the Great Lakes. 



8p. Chab. Similar to L. glaucus, but much smaller, the youns darker colored. AduU. 

 in summer: Mantle pale pearl-blue (a shade darker than In L. elaucus); remiees similar, 

 but slisbtly paler, pussine terminally into pure white. Rest ol t^e plumaee hoow-whitn. 



* M. Cbambeblain, in TUe Auk. July 1889, pp. 214-215. 



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