LARID^— THK GULLS AND TERNS. 225 



The great Burgomaster Gull is an Arctic species which occa- 

 sionally visits Lake Michigan in winter. It is the largest of 

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

 back" {L. manmus). 



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

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

 weather, it is said to pirate upon the eiders (Somateria molUs- 

 svma horealis), 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 young 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 Empetrum m- 

 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. 



ICEIANO GTTLL. ' 



Popular BynonTm. ^White-winged Gull. 



Larus argentatus Sabine, Trans. Linn. Soc. xil, 1818, 646 (not of Bbi^xn. 176i). 



Larus leucopterus Fabee, Prodr. Isl. Orn. 1822, 91.— Sw. & Rich. F. B.-A. ii, 1831, 418.— Nun. 

 Man. ii, 183t, 3D5.— Aud. Orn. Biog. ill, 1835, 553. pi. 282; Synop 1839, 327; B. Am. vii,1814, 

 159. pL 447.-LAWE. in Baird's B. N. Am. 1858, 843.-BAliiD, Cat. N. Am. B. 1859, No. 658. 

 —CouES, Key, 1872, 311; Chejk List, 1873, No. 514; 2d ed. 1882, No. 769; B. N. W. 1874, 

 622.-EIDGW. Norn. N. Am. B. 1881, No. 661; Man. N. Am. B. 1887, 26.-B. B. & B. Water 

 B. N. Am. ii, 1884, 216.— A, 0. U. Check List, 1886, No. 43. 



Larus arctious Macgill. Mem. Wern. Soo. v, 1824,-68. 



Larus glauooides "Temm." Meter, Tasohenb. Vog. Deutsohl. iv, 1822, 197.— Tbmm. PI. Col. 776 

 livr. Introu. Larus, 1828. 



Larus ialandious Edmonst. Mem. Wern. Soo. iv, 1823, B06 (neo op. cii. p. 186=£. glauous). 



Larus minor Bbehm, Vog. Deutsohl. 1831, 736. 



Laroides subleucopterus Bbehm, t. o. 746. 



Larus (Glaucus) glacialis Bbuch. J. f. 0. 1853, 101 (neo Macgili.. 1824). 



Eab. Bange about the same as that of L. glauous. South in winter to ooast of Massa^ 

 ohusetts and the Great Lakes. 



Sp. Ghab. Similar to L. glauous, but much smaller, the young darker colored. Adult, 

 in, summer: Mantle pale pearl-blue (a shade darker than in L. glaucus); remiges similar, 

 but slightly paler, passing terminally into pure white. Best of the plumage snow-white. 



* M. ObaubebIiAIN, in Tht Auk, July 1889, pp. 214-316. 

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