288 
Rev. H. B. Tristram on the 
two he stated to be the largest of all the hunting Falcons. My 
conjecture is that Terakel is merely the female F. sacer, and that 
I/Abli is the Goshawk, which once, and once only, I saw in the 
Desert trained for the chase. Its owner was not a learned 
falconer, and could give it no other name than Tair el h'ohr, 
generally used by the ignorant for all Falcons collectively, but as 
a specific designation applicable either to F. lanarius or F. pere - 
grinus only. Bou Disah had with him only Sakkr, all of the 
same size, therefore of the same sex; but he states that Et 
Terakel is very like it, only larger and finer. In another part of 
the Desert many months afterwards I met with a Sheik who 
possessed seven of the F. sacer , all of the same size, which he 
called Sakkr, but which were larger than the birds of Bou Disah, 
and therefore I conjecture them to have been his “ Et Terakel.” 
I subjoin the description and measurements of Bou Disah's 
bird, as jotted down at the time — 
Whole length 18 inches. Length of wing from carpal joint 
12| inches. Length of tail 6J inches. Length of tarsi If inch. 
Wings closed to within an inch of the extremity of the tail. 
Feet and tarsi very pale blue. Cere the same colour, with the 
beak black. Irides dark brown. Chin white, with the moustache 
scarcely visible. The whole upper plumage a uniform slate- 
colour. Ten bars on the tail. The first toe If inch; hind toe 
J inch. 
I also give a description and measurements of seven Falcons iu 
the possession of Ali Bey of Tuggurt, in December 1856 :— 
Whole length 19f inches. Length of wing from carpal joint 
14 inches. Length of tail 7 inches. Length of tarsi 2f 
inches. Wings closed to the extremity of the tail. Feet and 
tarsi lemon-coloured. Cere greenish-white. Bill bluish-grey, 
but darker at the tip. Irides almost black. Moustache very 
faint and small, running \ inch down from the eye. The throat 
white. The top of the head reddish ash-colour, with fine black 
longitudinal streaks. The breast and lower tail-coverts white 
with oblong slate-coloured spots. The back and upper plumage 
uniform slate-brown ; the feathers slightly fringed with ginger- 
brown. The tail with ten chestnut-coloured bars. Under-wing 
plumage brown, with white bars. 
