DETA I LED LIST OF BIRDS. 
283 
.820 (bis). Caccabis pallescens> sp. nov. 
One specimen^ a male, killed at Karbu, Ladak, on J une 
the 26th, differs sufficiently from the ordinary Indian type 
to require special notice. 
The whole upper and under surfaces are far paler and 
grayer (the crown, back of the neck, rump, upper tail- 
coverts and breast most conspicuously so) than those of any 
of the innumerable specimens shot south of the snowy range 
that I have ever seen. Structurally the birds agree, except 
where the bill is concerned, for in the Ladak bird it is 
slightly more lengthened and compressed than in any of 
the Indian specimens before me. It measures straight 
from the forehead to point 0*96, and from anterior margin 
of nares to point 0'62. In the Indian birds these dimen- 
sions may be taken as 0*86, and 0*59. The bill is somewhat 
more compressed, and the culmen slightly more raised. The 
difference in colour is very marked, and if this difference 
and that of the bills is constant, I should propose the name 
of C. pallescens. 
In C. grcecaj the bill is much shorter as it seems to me than 
in either of the Ladak or Indian birds, the bills of speci- 
mens before me measure, from the forehead 0*74, from ante- 
rior angle of nares, 0 51. 
In colour the Ladak bird somewhat reminds me of" the 
species from Aden, which I have called C. arenarius, but this, 
while much less rufous and generally paler than C. chukor 
and C. graca, is not so grey as the Ladak specimen. I am 
not aware that the Aden bird has ever been discrimi- 
nated, and I may therefore mention that it is a considerably 
smaller bird than any of the others. Wing 5*75 against 6*75 
in the Indian and Ladak birds. Tarsus 1*4 against I'7 
in the Indian birds (similarly measured) ; the tarsus too is 
more slender. Mid toe and claw 1'4 against 1'9 in the Indian. 
There is a fine specimen of this little Chikone in Colonel 
Tytler^s museum, given him by Babu Rajendra Mallik, who 
obtained a number from the captain of some Arab vessel, 
trading from Aden. This was the first specimen I ever saw, 
but I have since obtained a similar one direct from Aden, 
