79 
ever old the Laggar, the general tint of the upper surface is 
brown or greyish brown, no doubt shaded with slaty in very 
old birds, but still a brownish slaty, whereas the whole upper 
surface of the old Peregrine is a pure slaty blue of different 
shades, not a trace of brown about it. | 
Generally* it may be said, that if any beginner meets in India 
with a true Falcon of large size, without any markings on the 
upper surface of the centre tail feathers, itis F. Jugger. If there 
are markings, and these are large, round or oval spots, the bird is 
F. Sacer (or a nearly allied and as yet undiscriminated species). 
If the markings are bars, and the head and nape are nearly 
black, the latter, with a few rufous or buffy feathers, it is Peri- 
grinator, or Atriceps, the distinctions between which have already 
been pointed out; while, if the head is brown, or in adults, deep 
blackish slaty (Peregrinus), or rufous, (Babylonicus) ; it is Pere- 
grinus if the cheek stripe is broad and massive, Babylonicus if 
long and narrow. 
No. 12. Falco Babylonicus, Gurney. 
Tue Rep-cap FAtLcon. 
I have, as yet, been unable to obtain any detailed account of 
the nidification of this species. It breeds, I know, in, or close 
to, the Peshawur valley, as well as in Cashmere, laying three or 
four eggs in March and April, but I have hitherto failed to 
procure the eggs. The type specimen of this bird, was obtained 
by Capt. Irby, in October 1858, at Nawabganj, (Barabunkee) 
Oudh, and is now in the Norwich Museum. In regard to this, Mr. 
Sclater remarked, that Capt. Irby’s specimen, seemed to be re- 
ferable to a new species of true Falcon, most nearly allied to 
F. Barbarus ( Ibis, 1859, p. 184,) which is the #. Peregrinoides 
of Temminck. Mr. Gurney proposed the name Babylonicus, the 
first specimen of the bird having been obtained in Babylonia, 
by the Euphrates Exploring Expedition. This latter bird was 
in immature plumage, and was erroneously entered in the cata- 
logue of the Kast India Company’s Museum, where it was deposit- 
ed as F. Perigrinator. Besides these examples, there are two 
adults in the Norwich Museum, one of which, is said to be from 
Abyssinia. ‘The following are the dimensions given by Mr. 
Sclater. 
* T am now doubtful whether these discriminative points are quite con- 
stant, but I let what I have written stand, for the present. 
