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Show 1 •8/9.] MR. H. SEEBOHM ON SOME ASIATIC THRUSHES. 805 ^a\,thM-°f H somewh.at df""ker bird than Swinhoe's type ; but finding in the Museum at Philadelphia a second skin agreeing precisely with the latter (obtained, I was informed, by the Perry Expedition to •Japan), I cut the Gordian knot bv assuming Swinhoe's bird to be the normal adult male and Hume's to be a partially melanistic form not uncommon among Thrushes. Since then the return of Mr. Wardlaw Ramsay from Afghanistan has placed the Tweeddale collection within reach ; and I find in it the skin of a Thrush from Assam (which I propose to be figured as an illustration to this paper) which apparently agrees with Hume's description of G. tricolor; and I also hear that Captain Elwes possesses two skins from the same locality. These facts have obliged me to alter m y opinion as to the identity of the Indian with the Chinese specimen. I am now inclined to identify Hume's bird as the fully adult male of T. dissimilis (Blyth). Both Hume's type and the skins in the Tweeddale collection were shot in Assam; and in 'The Ibis' for 1872 (p. 136, pi. vii.) is an excellent figure of the immature male or female of T. dissimilis (Blyth), the original of which was shot by Colonel Godwin-Austen in the same locality. The two species will therefore stand as follows:- TURDUS DISSIMILIS (Blyth). (Plate LXIV.) Geocichla dissimilis, Blyth, J. A. S. Beng. 1847, p. 144. Turdulus cardis (Temm.), apud Jerdon, B. India, i. p. 521 (1862). Geocichla tricolor, Hume, Ibis, 1871, p. 411. Adult male with the entire head, neck, and throat dark slate-grey, nearly black, shading into paler slate-grey on the rest of the upper parts. Axillaries, under wing-coverts, sides of the breast, and upper portion of the flanks brilliant orange-chestnut, shading into brown on the lower portion of the flanks, and into white on tbe centre of the breast, belly, and under tail-coverts. Female and immature male. Upper parts differing from the adult male in being pale slate-grey suffused with russet-brown on the forehead, and with olive-brown on the centre of the back. Throat nearly white in the centre, the feathers on the sides of throat and chest having dark-brown fan-shaped terminal spots. Rest of the plumage similar to that of the adult male. Hab. Assam, occasionally straying westward as far as Calcutta. TURDUS HORTULORUM, Sclater. Turdus pelios, Bonap. Consp. Gen. Av. i. p. 273 (1850, nee plur. auct.)?. Turdus hortulorum, Sclater, Ibis, 1863, p. 196. Turdus campbelli, Swinhoe, Ann. Nat. Hist. 1873, xii. p. 374. Turdus chrysopleurus, Swinhoe, Ibis, 1874, p. 444. Until a fully adult male has been obtained from Southern Siberia, we can never be absolutely sure to which of the two species Bonaparte's name properly belongs; but the bird from the Amoor is more likely to be identical with one from China than with one from Assam. According to the new-fashioned system adopted by the |