30 BRITISH BIRDS. 
and Java F. melanogenys breeds, resembling the South-African and the 
North-west Indian forms in having the underparts below the breast very 
closely barred, and the latter in having those parts greyish. The South- 
American form found in Chili and Patagonia, F. cassini, is scarcely distin- 
guishable from F. melanogenys and F. atriceps. 
Another allied species, the Barbary Falcon (Ff. baréarus), of which F. 
babylonicus is probably the female, inhabiting North Africa, Turkestan, 
and North India, belongs to the Lanner group of Falcons, differing from 
the Peregrine group in having more or less chestnut on the nape, and 
would not require notice here were it not for the fact that it apparently 
interbreeds with the Peregrine, producing intermediate forms known as 
F. punicus, which are found on the shores of the Mediterranean. The 
variations of plumage in this supposed species are, to quote the words of 
Mr. Gurney (‘ Ibis,’ 1882, p. 316), “nota little remarkable, some specimens 
being almost undistiuguishable in markings and coloration from F. minor, 
others approaching exceedingly near in these respects to F. barbarus, whilst 
the majority exhibit a plumage more or less intermediate between these 
two extremes.” When we consider that F. punicus is a slightly larger 
bird than either F. minor or F. barbarus, and have regard to its geo- 
graphical distribution, to the pale slate-grey of its upper parts, and its 
tendency to be suffused with slate-grey on the underparts below the breast, 
it seems most probable that it is an intermediate form between F. barbarus 
and F. peregrinus. 
SITE OF PEREGRINE’S NEST ON THE PETCHORA. 
