EGGS OF NORTH AMERICAN BIRDS. 9 



ward, in June. Nests of sticks and weeds, placed on cliffs, or 

 on the ground. 



55. Short-billed Gull, Icarus hrachyrhynchus. Eggs, indis- 

 tinguishable from those of No. 54. Breeds in Arctic America. 



56. Mew Gull, Larus canus. Eggs, 2 or 3, broadly oval, 

 varying from olive green to yellow and green, spotted and 

 blotched with dark brown and purple ; 1.50 -f- 2.08 to 1.55 -|- 

 2.25. Extralimital ; breeds in Northern Europe and Asia. The 

 bird has been taken in Labrador. 



57. Heerm Ann's Gull, Larus heermanni. Eggs, oval or 

 oblong oval, varying from pale to dark drab, boldly marked 

 with brown and grey; 1.55 -\- 2.27 to 1.65 -f- 2.35. Breeds on 

 the Pacific coast of North America, in May. 



58. Laughing Gull, Larus atricilla. Eggs, 3 or 4, oval, 

 varying from bluish white to ashy green, lined, spotted, and 

 blotched with brown, umber, and lilac, the lined style of mark- 

 ing predominating, on the average ; 1.52 -\- 2.00 to 1.65-}- 2.20. 

 Nests of weeds, placed on the ground. Breeds on the Atlantic 

 coast, from Maine to Brazil, in the northern portion early in 

 July, but further south a little earlier. 



59. Franklin's Gull, Larus franMinii. Eggs, 2 or 3, 

 oval, pale greyish green, or light drab or olive, with rather 

 obscure irregular markings of dark brown ; 1.45 -(- 2.00 to 1.50 

 -}- 2.25. Breeds in the Interior of North America, usually 

 north of the United States. 



60. Bonaparte's Gull, Larus Philadelphia. Eggs, 3 or 4, 

 oval, varying from greenish to bi'own, spotted and blotched 

 with marks of brown, umber, and lilac; 1.13 -}- 133 to 1.15 -|- 

 1.45. Nests of grass and sea-weeds, placed on cliffs or on the 

 ground. Breeds across Northern North America, rarely along 

 the coast, and usually north of the United States, late in June. 



61. Ross's Gull, Jihodostethia rosea. Eggs, pyriforra, dark 

 olive, spotted with darker. Breeds in extreme northern Arctic 

 regions. 



62. Sabine's Gull. Xema sahinii. Eggs, 2, oval, deep 

 yellowish or greenish brown, obscurely spotted and blotched 



