294 THE BIRDS OF THE BRITISH ISLES. 



usually with a slight yellowish tinge ; the back, wings, and tail 

 are blue-grey, faintly tinged, rather than mottled, with pale ashy 

 brown ; the quills are darker. Dr. Eagle Clarke corrected the 

 many erroneous descriptions of the soft parts, and first described 

 the colour of the young. Roughly the bill is greenish brown, 

 tinged in places with blue and pink, and brownish horn at the 

 tip; the legs are greenish grey, the irides dark brown. Young 

 birds are a purer and a more silky white, and the grey is uniform, 

 purer and paler than in mature birds ; the bill is paler, the 

 legs are livid white. Length, 19 ins. Wing, 13*25 ins. Tarsus, 

 2 ins. 



Capped Petrel. Pterodroma hasitata (Kuhl). 



Single examples of three species of the genus Pterodroma are 

 known to have wandered to England or Wales, but their 

 appearance was evidently purely accidental. The Capped 

 Petrel, now believed to be extinct, probably killed by rats, 

 formerly nested in some of the West Indian islands, but was, 

 apparently, always rare. In spring, 1850, one, evidently 

 exhausted, w^as found by a boy entangled in a furze bush near 

 Swaftliam, in Norfolk. It is about the size of the Manx Shear- 

 water, more distinctly brown on the "cap," back, and wings, 

 and with the forehead, back of the neck, and upper tail-coverts, 

 as well as the ,under parts white ; round the eye, and from the 

 eye to the crown is brown, the tail is also brown. The bill is 

 black, and the legs yellowish, the tips of the toes and outer 

 edge of the webs almost black. Length, 16 ins. Wing, ir3 

 ins. Tarsus, 1*5 ins. 



Collared Petrel. Pterodroma hrroipcs (Peale). 



So far as is known, the Collared Petrel only nests in the 

 western Pacific, but like all petrels is a great wanderer ; if 

 there are no undiscovered Atlantic breedins stations, the bird 



