154 
OBNITnOLOGY. 
thologically unknown hills and plains of Yarkand^ and it is 
Tvith the avi-fanna of these that I shall first deal. 
Of these fifty-niue species,, seven, viz. : — 
8 bis Falco Hendersoni (PL I.) 
*492 bis Saxicola Hendersoni (PI. XIII.), 
546 bis Siiya albosuperciliaris (PI. XVIII.), 
679 bis Podoces Hendersoni (PI. XXII.), 
6r9 ter „ humilis (PI. XXIII.), 
769 ter Galerida magna (PL XXX.), 
820 ter Caccabis pallidns, 
are probably new to science ; but of these one species, the 
last mentioned, is only doubtfully entitled to specific sepa- 
ration, and is connected with the allied C. chukar, by the 
pale Ladak form, for which I have, with much hesitation, 
'proposed the name of C pallescens. 
Both these forms differ markedly from the Indian bird, 
but whether they are to be considered merely local races, 
or ranked as distinct species, is a matter in regard to which 
opinions will differ, and to my mind, is one of but little 
moment ; they are quite as distinct I think as C. grceca 
and C. chukar, but I am not personally prepared either to 
assert or deny the specific distinctness of the two last- 
named birds. 
Of the other species, supposed to be new, one is a noble 
Falcon, differing somewhat in type from any of the known 
sub-groups, but possessing more or less marked affinity with 
the Gyr Falcons, the Lanners, and the Saker, and having a 
special interest both as forming a sort of connecting link 
* The numbers prefixed to the species are those of Dr. Jerdon's 
" Birds of India," or, where the species is not included by him, of my M.S. 
catalogue, which embraces, besides those species described by him, all the 
birds discovered, or first observed in India, subsequent to the publication of 
Jerdon's work, as well as all the known birds of Ceylon, the Andamans and 
Nicobars, Burmah, Assam, and Eastern Bengal, Ladak and Tibet. For 
facility of reference, Dr. Jerdon's numbers (though I do not concur in 
the arrangement followed by him in many cases) have been for the pre- 
sent retained, and the other birds intercalated, as " bis," &c., where tlieir 
natural or supposed affinities indicated. I have now, for the convenience 
of Indian ornithologists, to whom Yarkand will probably soon cease to be 
terra incognita, similarly intercalated the few peculiar Yarkand species 
as yet known to u«?. 
