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Show 1866.] VISCOUNT WALDEN ON BIRDS FROM TENASSERIM. 547 and not so decidedly cinereous on the upper surface; the bill is more compressed. All these points evince an approach to D. longicaudatus, and excite a suspicion of hybridism. But they are probably nothing but the characteristics of an intermediate species-a link of transition, many of which are to be found in the unstable family of the Dicruridar. The type of Vieillot's genus Dicrurus being Corvus balicassius, Linn. (=Edolius viridescens, Gould, = Ba-licassius philippensis, Bp., ex Manilla), a totally distinct generic form, the long Fork-tailed Drongos must be referred to the next generic synonym, Buchanga, Hodgs., the type of which is Edolius albirictus, Hodgs., ex Nipaul. The following are the principal measurements of the Tenasserim race :- Wing 5| inches ; bill from nostril f; bill from forehead 1 ; uro-pygials 3£ ; outer rectrices 5-f. Somewhat larger than the Javan bird, it is considerably smaller than the Himalayan B. pyrrhops, Hodgs. The Himalayan race of B. lonyicaudata has yet to be described and named. It is a well-marked form, and very distinct from the Malabar type. 19. MIXORNIS RUBICAPILLA, (Tickell). Motacilla rubicapilla, Tickell, J. A. S. B. 1833, p. 576. no. 27. No. 40. Salween Valley. The type of this species was procured by Colonel Tickell in Burru-bhoom, a district of Central India. When compared with specimens from Maunbhoom, a neighbouring district of Central India, this Tenasserim specimen exhibits no difference beyond that of the bill being perceptibly longer; and when compared with Himalayan specimens no difference whatever can be detected ; and Mr. Hodgson's specific titles of chloris and ruficeps given to the Himalayan race have therefore been correctly superseded by Dr. Jerdon. In the ' Catalogue of the Calcutta Museum' Tenasserim is given as the habitat, not only of this species, but also of M. gularis, (Horsf.). This last species is very distinct, and was founded on the Motacilla gularis, Raffles, Tr. Linn. Soc. xiii., his type being from Sumatra, and not from Java - a fact which has been overlooked by almost every writer, the mistake probably arising out of Raffles's bird having been .figured and described by Horsfield in his ' Zoological Researches in Java.' Sir Stamford Raffles's type specimen still exists in the India Museum. It belongs to a species readily distinguishable from Tickell's bird, by being above almost uniform rufous brown, with a tinge only of olive on the nape and rump. The head, wings, and tail are alike, and of a still darker brown. Underneath it closely resembles the continental species, but is brighter yellow, and has the throat more boldly streaked. A second and fresh specimen from Sumatra is in m y collection, and is identical with the type. Malacca possesses a species which is very nearly allied to, if not identical with, the Sumatran form. The Javan race, hitherto by all authors referred to Timalia gularis, Horsf., is figured in the ' Planches Coloriees,' and is there described, as also by Prince Bonaparte in the ' Conspectus,' as having the throat white. From both these descriptions it also appears to |