lOp. Wilson's Petrel. 



Breeds in the southern hemisphere in February 

 and Marcli and spends tlie summer off the Atlan- 

 tic coast as far noi'tli as Newfoundland. This spe- 

 cies can be distinguished from Leach Petrel by 

 its square tail and from the Stormy Petrel by its 

 large size and yellow webs to its feet. These 

 birds are the greatest wanderers of the genus, 

 being found at different seasons in nearly all 

 quarters of the globe. Their single egg is white. 

 Size 1.25 X. 90. 



[110.] White-bellied Petrel. 

 Fregetta grallaria. 

 A small species (length about 7.5 inches) in- 

 habiting southern seas. Recorded once at Flor- 

 ida. General plumage blackish. Upper tail cov- 

 erts, bases of tail feathers, under wing coverts, 

 and abdomen, white. 



[111.] White-faced Petrel. Pelagodroma 

 marina. 

 Range. — Southern seas, accidentally north to 

 the coast of Massachusetts. This beautiful spe- 

 cies is of about the same size as the Leach's 

 Petrel. It has bluish gray upper parts; the whole 

 under parts, as well as the forehead and sides 

 of head, are white. 



TUBE-NOSED SWIMMERS 



Oceanites oceanicus. 



White 



Wilson's Petrel 



White-billed Petrel 



White-faced Petrel 



These birds have the same characteristics as do others of the species, pat- 

 tering over the water with their feet as they skim over the crests and 

 troughs of the waves. They are not uncommon in the waters about New 

 Zealand where they breed. Their single eggs are about the same as Leach's 

 Petrel, are brilliant white and are, very strongly, for a Petrel egg, wreathed 

 about the large end with dots of reddish brown. Size 1.32 x .90. Data. — Chat- 

 ham Is., New Zealand, January 7. 1901. Egg laid at end of a burrow. Collec- 

 tor, J. Lobb. This egg is in Mr. Thayer's collection. 



71 



