104 BULLETIN 121, UNITED STATES NATIONAL MUSEUM. 



as they drop suddenly beneath the surface of the water with their Mings 

 spread to seize some scrap of food. They unhesitatingly go completely under 

 and reappear again with their wings still spread. We were visited by such a 

 flock on November 1, 1901, in the Southern Indian Ocean. Having first seen 

 it on September 25, 1901, we had never had more than two or three with us 

 until this flock arrived. Many of them were evidently molting, as several of 

 the smaller primaries were missing on either side. This exposed the paler part 

 of the primaries still present, and gave the appearance of a white patch and 

 a piece cut out from the center of the wing. They may be caught and landed 

 with stout thread entanglements, but ordinary thread should not be used, as 

 it is apt to entangle the bird and break, leaving it disabled in the water. This 

 large flock remained with us for about a week, when it began to dwindle, and 

 on November 12, on our turning to go south, the birds left us altogether. 



Nesting. — Capt. F. W. Hutton (1865) gives us the following brief 

 account of its breeding habits : 



It is very common at sea from May to August; but retires to Kerguelen's 

 Land and other places in September or October, to breed. Each pair burrows 

 horizontally into wet, peaty earth from 2 to 18 feet. At the end of the hole 

 they form a large chamber, and construct in the center of it a nest similar, ex- 

 cept in size, to that of the albatross (Z). cxujans), in the hollowed top of which 

 the female lays one white egg. They seldom leave their burrows in the 

 daytime, and when one happens to do so it is at once hunted by a "NeHj%" 

 although no such jealousy exists at sea. From this habit of flying only by 

 night it is called "Nighthawk" by the sealers. 



Mr. Harris's party, when wrecked on Kerguelen's Land, used to dig these 

 birds out of their burrows, and eat them ; and in order to save useless digging, 

 for their spades were only made from the staves of old casks, they would hold 

 one to the mouth of a hole, and make it cry out, when, if another was inside, 

 it would answer. 



If the black-tailed shearwater breeds regularly on Kerguelen 

 Island, it seems strange that it Avas not noted by Doctor Kidder (1875) 

 during his protracted visit on this island in 1874 and 1875. 



I^^ggs. — Mr. A. J. Campbell (1901) describes the single egg as: 



Roundish or broad oval in shape ; texture of shell close but somewhat coarse ; 

 surface very slightly glossy ; color, pure white when first laid, but soon be- 

 comes soiled with brownish earthy stains. 



The eggs above described were collected on Macquarie Island the latter 

 part of November, 1896, by Mr. Joseph Burton, per favor of Mr. Joseph 

 Hatch, the lessee of the island. The eggs were accompanied by a skin of 

 the bird. Macquarie Island is an exceedingly rough and rugged place, almost 

 devoid of vegetation, situated 860 miles southeast by south from Hobart. 

 It is about 20 miles long by about 7 miles broad, its greatest height being 1,300 

 feet above sea level. 



During an interesting conversation with Mr. Burton, after his return from 

 Macquarie Island, where he remained 3i years, he informed me that brown 

 petrels generally appear in numbers after the middle or towards the end of 

 August (he noted one bird as early as the 12th of that month), and depart 

 about the end of May. Fresh eggs may be collected the end of November or 

 beginning of December, but, strange to say, in March and April (1900) some 

 fresh eggs were observed in the burrows. 



