19 ^ 
LA RI D.L, 
NATATOBES. 
LARID/E. 
PLATE CCCXX. 
FORK-TAILED PETREL. 
THALASSIDROMA BULLOCKII. 
The Fork-tailed Petrel, which was distinguished from the 
Storm Petrel by Mr. Bullock during an excursion for the 
sake of ornithological information, in the year 1818, is a 
regular visitant at St. Kilda and other islands of the Hebrides, 
and it also occurs on many parts of the coasts of England, 
Wales, and Ireland. On the coast of North America this 
bird is common. 
The habits of the present species resemble those of the 
foregoing in a great degree. 
Its flight is performed with stronger strokes of the wings, 
and consists of more lengthened sweeps. 
This bird is more shy than the Storm Petrel, and its 
call note is different; that of the Fork-tailed Petrel sound¬ 
ing like the words pure wit, pure wit! while the Storm 
