FORKED-TAILED PETREL. 



PROCELLARTA LEUCORRHOA, Vieillot. 



Procellaria leucorrhoa, Vieillot, Nouv. Diet. xxv. p. 422 

 (1817). 



Thalassidroma leachii, Naum. x. p. 575 ; Macg. v. p. 451 ; 



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 



