EGGS OF N0BT3 AMERICAN BIRDS. 7 



39. IvoRT Gull, Gavici alba. Eggs, 1, oblong oval, light 

 yellowish olive, marked throughout with small blotclies of dark 

 brown, with lighter shell-markings; 1.70 -{-2.45 to 1.75 -|- 2.50* 

 Breeds in Arctic seas, on rocky cliffs, in June. 



40. KiTTiwAKE, Rissa tridactyla. Eggs, 2 or 3, oval, yel- 

 lowish buff, spotted and blotched with rounded marks of brown 

 or lilac; 1.60 -f 2.20 to 1.70 -[- 2.25. Nest placed on cliffs, 

 composed of sea-weeds, etc. Breeds from Gulf of St. Law- 

 rence, northward. 



40a. Pacific Kittiwake, Missa tridactyla pollicaris. Eggs, 

 indistinguishable from those of No. 40. Breeds on coasts of 

 North Pacific and Bering's Sea. 



41. Red-legged Kittiwake, Bissa bierirostris. Eggs, in- 

 distinguishable from those of No. 40. Breeds on the coasts 

 and islands of Behring's Sea. 



42. Glaucous Gull, Larus glaucns. Eggs, 3 or 4, oval, 

 varying from bluish white to dark brown, but generally pale, 

 spotted and blotched with rounded markings of brown and 

 lilac, usually of large size ; 2.14 + 2.95 to 2.25 -^ 3.00. Breeds 

 in the Arctic regions, late in June. 



43. Iceland Gull, Larus leucopteriis. Eggs, 3 or 4, oval, 

 deep brownish yellow, spotted and blotched with rather rounded 

 spots of brown and lilac, of varying shade ; 1.85 -)- 2.70 to 

 2.60 -\- 3.76. Breeds in the Arctic regions. 



44. Glaucous-winged Gull, Larus glaiccescens. Eggs, 

 indistinguishable from those of No. 43. Breeds on the coasts 

 of North Pacific. 



44a. Alaskan Glaucous Gull, Larus barroviamis. Eggs, 

 unknown. Breeds in Alaska. This species has recently been 

 described by Mr. Robert Ridgway. 



45. Kumlien's Gull, Lanes Jcumlieni. Eggs, indistin- 

 guishable from those of No. 43. Breeds on coasts and islands 

 of Cumberland Gulf. 



46. Nelson's Gull, Larus ndsoni. Eggs, unknown, but 



