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Show 1894.] MR. O. THOMAS ON GAZELLES FROM ALGERIA. 467 Jahren seiner Anwesenheit, sich verschaffen kcinnen" (Syst. Uebers. i. p. 340). I believed D. alboguttata " dead and buried," when I saw its resurrection in 1888 in the ' Catalogue of Marsupials.' I consider it my duty to give to this supposed Brazilian species of Didelphys eternal repose, and to deliver zoological literature from an error threatening to become hereditary from generation to generation. 2. On some Gazelles brought by Sir Edmund Loder from Algeria. By OLDFIELD T H O M A S. [Keceived June 5, 1894.] (Plate XXXII.) By the kindness of Sir Edmund Loder I have been permitted to examine and describe some Gazelles brought by him at different times from Algeria, a country in the Natural History of which he has always taken much interest. Of late years two Gazelles have always been recognized as natives of Algeria, namely G. dorcas, the Common Gazelle, and G. cuvieri, the Mountain Gazelle, or " Edmee." Many Gazelle-horns, however, evidently belonging to neither of these, having come into his possession, Sir Edmund undertook an expedition to obtain specimens of this unknown Gazelle, a quest in which he was fortunately successful. On his bringing back the specimens thus secured, together with another he had had some time in his possession, I was surprised to recognize no less than four species, two of them requiring description as new. The first of these is the Beem, an account of which is contained in the field-notes now to be read by Sir Edmund; while the other, being based on a skin purchased at Algiers many years ago, must unfortunately still remain a mystery as to exact locality until some other enterprising sportsman is able to find out where it really lives. Sir Edmund Loder is much to be congratulated on the success of his expedition, and on the increase of our knowledge about tbe Gazelles which has resulted from it. The following are the four species represented :- 1. GAZELLA DORCAS, L. The Common Gazelle of the Algerian Sahara generally. 2. GAZELLA CUVIERI, Og. A fine male specimen of the "Edmee" from the inouutains north of Biskra is among Sir E. Loder's trophies. (Its skull-measurements are given on p. 472.) 3. GAZELLA RUFLNA, sp. n. Very similar in coloration to G. ruflfrons, Gray, but distinguished |