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Show 1876.] MR. H. SAUNDERS ON THE STERNINJE. 649 two fine specimens, obtained near Bombay, a considerable extension of its range as hitherto known to us. There is no example of this Tern in the British Museum ; but the collections at Leyden, Frankfort, Mayence, and Berlin are more fortunate in this respect. STERNA FLUVIATILIS, Naum. Sterna hirundo (in part), Linn. Syst. Nat. i. p. 227 (1766), and of most authors. Larus bicolor, Larus sterna et Larus columbinus, Scop. Ann. i. Hist. Nat. p. 82, 1769 (nos. 110 & 112 im., 113 juv.). Sterna Jiuviatilis, Naum. Isis, 1819, p. 1847-48; Gray, Handlist, iii. p. 118 (1871) ; Sharpe & Dresser, B. Europe, pt. xi. (1872). Sterna senegalensis, Sw. B. W . At', ii. p. 250 (1837); Schl. Mus. P.-Bas, Sterna, pp. 16 & 17 (1863) (sp. no. 2 examined by U.S.). Sterna wilsoni, Bp. List, p. 61 (1838), et auct. American.; Gray, Hand-list, iii. p. 118 (1871). Sterna macrodactyla et macroptera, Blasius, J. f. Orn. 1866, pp. 7o, 76; Gray, Hand-list, iii. p. 118 (1871)- Sterna dougalli, Layard, B. S. Af. p. 369 (1867). This well-known species is found throughout Temperate Europe, Asia, and America, except on the Pacific coast. In winter it visits the coast of Africa as far south as the Cape of Good Hope, and has occurred as far to the south-east as Ceylon, specimens having been sent to me by Capt. Vincent Legge, R.A. Northwards it goes as far as Pekin (Swinhoe) ; but in Tibet and part of Siberia it is replaced by a form which I consider to be distinct, and for which I propose the name of STERNA TIBETANA, sp. nov. S. similis S. fluviatili sed ubique saturatior; supra schistaceo-cinerea,- subtus pectore dare vinaceo facile distinguenda. (From a specimen in Lord Walden's collection.) Four adult specimens from Tibet and several from Lake Baikal ascribed to A longipennis differ from the latter in having the bill and feet coloured as in S. fluviatilis, from which in turn they differ in having the sides of the neck, shoulders, and flanks of a clear grey, which assumes a darker and more vinous tint on the breast and abdomen ; the mantle and wings are also much darker. The bill and feet are smaller than in average S. fluviatilis, and of an orange-red, the former tipped with horn. It is possibly this species which Mr. H u m e mentions as breeding near Yarkand. The examples referred to above are all in breeding-plumage; but I believe S. fluviatilis is a rare bird even in Lower India, and only found there during the winter months. STERNA LONGIPENNIS, Nordm. Sterna longipennis, Nordm. in Erman's Verz. v. Th. u. Pfl. p. 17 (1835); Middendorff, Reise, Zool. p. 246, tab. 25. fig. 4 (1851); Schlegel, Mus. P.-B. Sterna, p. 23 (1863) (as regards |