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 

 UAbli 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- 

 grimis 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. sace?-, 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 

 12i inches. Length of tail 6| inches. Length of tarsi 1| 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. Chm 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 

 I inch. 



I also give a description and measurements of seven Falcons in 

 the possession of Ali Bey of Tuggui't, in December 1856 : — 



Whole length 19| inches. Length of wing from carpal joint 

 14 inches. Length of tail 7 inches. Length of tarsi 2^ 

 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 i 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. 



