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Show 1896.] ANTELOPES OF EASTERN ALGERIA. 813 Range, which form a sort of transitional zone between the mountains and the Sahara proper. Roughly speaking, this Gazelle is confined to a belt of country not more than 120 or 150 miles wide (and generally very much narrower). It may be found in plains, or even in low hills, within the southern mountain-chains, and on or near some of the sand-dunes on the confines of the Chotts. I have frequently seen it in the neighbourhood of the Chotts, but once into the Oued Souf and sand desert and all trace of it is lost and the Rhime takes its place. In the district of Sef el Menadi, where I have been twice with Sir E. G. Loder, and where he secured the first specimen of the Gazelle (the Rbime) which now bears his name, w?e found both Rhime and Dorcas on the same ground ; and this place may be marked as the most northern limit which the Rhime ever inhabits, as it never leaves the sand, I think, whilst the Dorcas does not go much further south than this. Probably there are several of these isolated islands of sand where the Rhime may be found. The best male Dorcas that I have shot had horns a little over 31 cm. in length, the best female 25 cm. (measured along the curve). They vary a good deal in colour according to the ground they frequent, and there is a slight variety among members of the same band. In 1893 there was on the plain of A m Naga a pure white one, no doubt an albino; but though m y hunter had frequently seen it, he was never able to find it for me. (2) The Rbime (Gazella loderi), Arab " El Bhlme," Tamahaq " HanJcut," is the common Gazelle of the Sahara. Enormous numbers are killed by the Arabs in the neighbourhood of Rhadamis, and their skins dressed and dyed with a dye made from the rind of pomegranates and exported from Rhadamis. They are to be found throughout the region of the great Ergs and everywhere in the Sahara sands where there is vegetation sufficient to support them. The only places where they are to be met with, I believe, north of El Oued Souf, are to the south-west of Bou Chaama and near Sef el Menadi. A number of their horns are always on sale at Biskra and sometimes the skins. Tbe male horns of the Rhime sometimes bear so close a resemblance to those of the Admi (Gazella cuvieri) that they are often sold and bought as such. The Admi horns are much less commonly seen than the Rhime; as a rule, they are to be distinguished. The general character of the Rhime horns as distinguished from the Admi are, so far as I can describe them, as follows :- In the Rhime among average specimens the horns form in their main outline a long evenly-tapering V, whilst in the Admi the horns so far up from their base are more inclined to the parallel before springing out laterally, and towards the points usually take an inward and forward turn ; this turn inward is rarer, though not uncommon, in the Rhime, but the forward bend at the top is common to both. I have remarked, too, that the annulations or notches are as a |