FORKED-TAILED PETEEL.
PR 0 CELL ARIA LEUCORRHOA, Vieillot.
Procellaria leucorrhoa, Vieillot, Nouv. Diet. xxv. p. 422
(1817).
Thalassidroma leachii, Naum. x. p. 575; Macg. v. p. 4 5 1 ;
Hewitson, ii. p. 520.
Cymochorea leucorrhoa, Yarr. ed. 4, iv. p. 37.
Thalassidroma leucorrhoa, Dresser, viii. p. 497.
Thalassidrome cul blanc, French.
Although it appears that this Petrel is only known to
breed in two or three British localities, it is, in my
experience, much more frequently picked up, storm-driven,
inland than the common Storm-Petrel. In
Northamptonshire, for instance, I am acquainted with
four or five occurrences of the present species in recent
years, whilst I only know positively of one Storm-
Petrel having been met with in the county. I have
seen a few Forked-tailed Petrels in the " chops of the
channel" and in the Bay of Biscay, but have no more
intimate acquaintance with the bird. In flight and
general demeanour at sea this Petrel closely resembles
the Storm-Petrel, but at close quarters alongside or
astern, may readily be distinguished from that bird by