538 PROCELLARIIDAE 
browner shade; greater wing-coverts, thinly edged with 
white; rump and upper tail-coverts (excepting the tips), 
white, this colour extending to the sides of the vent; 
tail-feathers, sooty-black with white bases. 
Adult female nuptial.—Simuilar to the male plumage. 
Adult winter, male and female.—Similar to the nuptial 
plumage. 
Immature, male and female.—Brownish-black, with very 
little or no white on the tail or wing-coverts. 
Brak. Black. 
Freer. Black. 
TripEs. Blackish-brown. 
AVERAGE MEASUREMENTS. 
TOTAL LENGTH ... ee ow» (°5> an. 
WING ae aoe tn Ome 
BEAK a ms oe San” yOiGmae 
TARSO-METATARSUS a oat, MOLD Sane 
Eee i oe sw IOS X85emne 
FORK-TAILED PETREL. Oceanodroma leucorrhoa (Vieillot). 
Coloured Figures.—Gould, ‘Birds of Great Britain,’ vol. v, pl. 
85; Dresser, ‘ Birds of Europe,’ vol. viii, pl. 613, fig. 2; 
Lilford, ‘ Coloured Figures,’ vol. vi, pl. 54. 
This, also known as Leach’s Petrel, and distinguished 
from the preceding species by its forked tail and larger size, 
is not uncommon in British waters after heavy gales from 
the North and West, which sometimes blow the bird far 
inland, and there are numerous records of examples being 
picked up dead or in an exhausted state. 
Mr. Ussher describes how great numbers were blown 
across Ireland during the south-westerly gales which raged 
from the latter end of September to the middle of October, 
1891. Specimens were then obtained in no fewer than 
eighteen counties, namely: — Kerry, Waterford, Clare, 
Limerick, Tipperary, Dublin, Kildare, Queen’s County, 
Westmeath, Galway, Mayo, Leitrim, Cavan, Down, Antrim, 
Londonderry, Tyrone, and Donegal. ‘‘ A number were seen 
flying about the Shannon in the neighbourhood of Limerick 
