484 ON FALCO BABYLONICUS AND FALCO BARBARUS. 
Middte 
Wing, Tail. Tarsus. toe, s. # 
THe in. in, in. 
From Kurrachi, collected by Col. 
Butler (immature in change) east? L090 5:85 1:80 1-80 
From Arung, near Raipur, Central 
Provinces, collected by Mr. Blewitt 
(imm ature inchange) . 11:05 5:70 1°75 1:70 
From Delhi, collected by Mr. Hume 
(immature in change) .. 12-15 5°55 170 1:70 
From Delhi, collected by Mr. Hume 
(imm ature in change) .. 11:20 5 65 1:70 175 
From Eastern Nara, Sind, collected 
by Mr. Doig (adult)... 1125 5°40 170 170 
From Guzerat, Sind, collected by My. 
Doig (adult) tas 11°35 5°50 1:70 1:70 
I must also refer to a specimen which has much perplexed 
me, and whichis contained in the collection presented by 
Mr Hume to the British Museum. This Falcon was con- 
sidered by Mr. Hume to bea female of F. barbarus ; it was 
obtained by Mr. F. R. Blewittin the Nursingpoor district of 
the Indian Central Provinces on 16th December, 1869, and 
agrees in coloration with the most fully adult males (as I 
conceive them to be) of F. babylonicus, but is a slightly larger 
bird. 
Elaborate measurements of this specimen, taken from it 
whilst in the flesh, are quoted by Mr. Hume in “Stray Fea- 
thers, ” Vol. I, p. 21, and from these I extract the following for 
comparison with others ahove recorded, viz.: Wing, 11:40 
inches; tail, 6°40; tarsus, 1°80; middle toe s. w., 1:80. My own 
measurements, taken from this specimen in the skin, give a 
slightly different result, viz: Wing, 11°70, tail, 5°60; tarsus, 2 ; 
middle toe s. u., 1:90. 
Mr. Hume, writing (loc. cit.} of this Falcon, and of the male 
obtained by Dr. Stoliczka in Cutch, of which I have already 
given my measurements, states that heat first referred both 
of them to F. babylonicus, but subsequently became convinced 
that they were a male and female of #. barbarus, and adds 
“in both specimens the sexes were ascertained and recorded 
by, I need not say, careful observers.” 
Notwithstanding the strong evidence of Mr. Hume’s state- 
ment, I cannot but suspect that some accidental error may 
have occurred in determining the sex of the supposed female _ 
specimen, and that in reality it is not a female of #. barbarus, 
but an unusually large and very adult male of #’. babylonicus, 
and I conceive that some confirmation of this suspicion arises 
from the circumstance that on the ticket attached to this- 
specimen, presumably by the collector, a blank space was 
left for the sex, which has beer filled with the word “ female” 
