EGGS OF NORTH AMERICAN BIRDS. 3 



13. Puffin, Fratercvla arctica. Eggs, white when fresh; 

 occasionally mottled with greenish and lilac ; 1.20 -f- 2.30 to 

 1.70 -f- 2. SO ; deposited in burrows dug by the birds. Breeds 

 on coasts and islands of Eastern North America, from Bay of 

 Fundy, northward, in first w^eek in July. The most common 

 species. 



13a. Large-billed Puffin, JFratercula arctica gladalis. 

 Eggs, not to be distinguished from those of No. 13. Breeds 

 on coast and islands of North Atlantic, from Spitzbergen to 

 Baffin's Bay. 



14. Horned Puffin, Fratercula corniculata. Eggs, 1, 

 oblong oval, white; 1.75 -f- 2.75 to 1.80 + 2.80. Breeds on 

 coasts and islands of North Pacific, in rocky crevices, in May. 

 Known from those of No. 13 by the more elongated form. 



15. Rhinoceros Auklet, CerorJdnca monocerata. Eggs, 

 1, oval, dirty white, not unlike that of a common hen ; 1.81 -f- 

 2.61 to 1.85 -|- 2.65. Breeds on coast and islands of both coasts 

 of Pacific, from California and Japan, northward, in burrows, 

 in May. 



16. Cassin's Auklet, Ptychoramphus alenticus. Eggs, 1, 

 oval or oblong oval, pure white; 1.25 -|- 1.80 to 1.30 -|- 1.95. 

 Breeds on Pacific coast of North America, from Farallones, 

 northward, in burrows. 



17. Paroquet Auklet, Cyclorrkynchus psittaculus. Eggs, 

 oval or oblong, white ; 1.45 -|- 2.25 to 1.50 + 2.35. Breeds on 

 coast and islands of North Pacific, from Aleutian to Kurile 

 Islands, northward, on naked rocks, early in May. 



18. Crested Auklet, Siinorhynchus cristatellus. Eggs, 1, 

 oval, white, with the shell roughened; 1.40 -f- 2.10 to 1.45 -f- 

 2,15. Breeds on coasts and islands of Noith Pacific, from 

 Kadiak and Japan, northward, under rocks and in crevices, 



early in May. 



19. Whiskered Auklet, Simorhynchus pygmceus. Eggs, 

 unknown Breeds on coast and islands of North Pacific, from 

 Unalashka through the Aleutian chain to Kamtschatka. 



