54 North American Birds Eggs. 



108. Ashy Petrel. Oceanodroma homochroa . 



Range.— California coast, breeding on the Farallones and Santa Barbara 

 Islands. 



This species, while not common, nests in all manner of locations on the 

 Farallones, concealing their eggs under any rock or in any crevice that may 

 attract their fancy. Their single white egg is only faintly if at all wreathed 

 with fine dust-like specks of reddish brown. Size 1. 15 x .86. Data.— Farallone 

 Is., California, June 12, 1895. Egg laid on sand in crevice at the base of a stone 

 wall; well concealed. Collector, Chester Barlow. 



108.1. Socorro Petrel. Orcdiiodrdnui soc(irroe,i}i<h. 



Breeds on Socorro, San Benito and Coronado Islands, placing its eggs at 

 the end of a burrow. Data.— San Benito Is., Lower California., July 12, 1897. 

 Single egg at the end of a burrow 3 feet in length. Egg pure white very finely 

 wreathed with pale reddish brown. Size 1.15 x .87. Collector, A. W. Anthony. 



109. Wilson Petrel. OrmnitcH (icrdincus. 



Breeds in the southern hemisphere in February and March and spends the 

 summer off the Atlantic coast as far north as Newfoundland. This species 

 can be distinguished from Leach Petrel by its square tail and from the Stormy 

 ((, y(7 Petrel by its large size and yellow webs to its feet. These birds are the 

 da greatest wanderers of the genus, being found at different seasons in nearly all 

 !5<-p^ quarters of the globe. Their single egg is white. Size 1.25 x .90. 



[110.] White-bellied Petrel. Frcgeiia grallaria. 



A small species (length about 7.5 inches) inhabiting southern seas. 

 Recorded once at Florida. General plumage blackish. Upper tail coverts, bases 

 of tail feathers, under wing coverts, and abdomen, white. 



[III.] White-faced Petrel. Pehigotlrnma marina, 



._, --_. Range. — Southern seas, accidentally north to the 



^' . coast of Massachusetts. This beautiful species is of 



/ \ about the same size as the Leach Petrel. It has a 



/. ■ bluish gray upper parts; the whole under parts, as 



'.. ' well as the forehead and sides of head, are white. 



,V These birds have the same characteristics as do 



' others of the species, pattering over the water with 



their feet as they skim over the crests and troughs of 



the waves. They are not uncommon in the waters 



l^^'"'"^-! about New Zealand where they breed. Their single 



eggs are about the same size as Leach Petrel, are brilliant white and are, very 



strongly, for a Petrel egg, wreathed about the large end with dots of reddish 



brown. Size 1.82 x .90. Data — Chatham Is., New Zealand, Jan. 7, 1901. 



P3gg laid at end of a burrow. Collector, J. Lobb. This egg is in Mr. Thayer's 



collection. 



