154 BULLETIISr 121, UNITED STATES NATIONAL. MUSEUM. 



Nesting. — Lieut. Boyd Alexander (1898) found this species breed- 

 ing in the Cape Verde Islands and noted that its burrows run far- 

 ther into the ground and are more tortuous than those of Pelago- 

 droma marina.. Mr. Ogilvie-Gi'ant (1905) found the Hawaiian 

 petrel preparing to breed on Praya Island, in the Azores, of which 

 he Avrites : 



We procured a single siiecimeu of Harcourt's stormy petrel, taken in a hole in 

 the rocks on Praya Island on April 25th ; on June 1st we picked up a dead speci- 

 men on Villa Islet, Santa Maria, but, at this season, the birds had not com- 

 menced to breed, and all their nesting-holes on tliat breeding-station were 

 empty. The tishermeu knew the bird well, and Seuhor Joao S. G. da Camara 

 kindly promised to procure specimens later on and forward them to England 

 in spirits. This he did, the birds having been captured in September. 



Mr. Ogilvie-Grant (1896) also found the species on the Salvages 

 and makes the following statement regarding its breeding there : 



Almost more interesting than the white-breasted species was the square tailed, 

 white rumped petrel, of which we obtained but a single example, caught at 

 night by our men on Great Salvage, though we saw several flying over the 

 neighboring seas from the deck of our steam tug. Tliis bird had not yet come 

 ashore to breed, and the only egg we obtained was taken on Lime Island, 

 Porto Santo, in the month of June. According to our Lanzarote pilot, this 

 species breeds commonly on the Little Piton, and it was with great regret 

 that we had to leave the Salvages without visiting this little Island. 



Mr. Leverett M. Loomis (1918) says of the breeding habits of 

 this species on the Galapagos Islands : 



A small breeding colony was discovered on August 13, 1906, on Cowley 

 Island, a steep turfaceous islet about two hundred feet in altitude, situate 

 east of Cowley Mountain, Albemarle Island. Two hard-set eggs, with parent 

 birds, were secured, also an egg with a dried embryo. Mr. Beck's labels fur- 

 nish the following particulars concerning them : One of the eggs, with living 

 embryo, was deposited in a slight hollow in the soil of a small cave in a hill- 

 side amongst " lava boulders ; " the other was placed on a little soil under a 

 large " lava boulder " on a hillside. The egg with the dead embryo was found 

 in a slight hollow in the soil at the end of a small cave in a hillside. Seven 

 young birds in various stages of down were obtained in similar situations. 



^^p's.— Godman (1907) says : " The egg of O. castro is white, with- 

 out any gloss, with a more or less evident zone of reddish dots round 

 one end, but these dots are never conspicuous." Eev. F. C. R. Jour- 

 dain has sent me the measurements of 32 eggs, collected from various 

 sources; they average 33.57 by 24,82 millimeters; the largest eggs 

 measure 36 by 26 and 35 by 26.1, and the smallest eggs measure 

 30.8 by 24.1 and 31.2 by 23.2 millimeters. 



Young. — Godman (1907) describes the nestling as "covered with 

 long wooly down of a sooty brown color." 



The Hawaiian petrel might be, and probably often has been, mis- 

 taken for the Leach petrel, which it somewhat resembles, but it can be 



