132 Zoological Proceedings of Societies. 



them were two undescribed species of Platycercun, Vig. Mr. Leadbeater 

 stated his intention of describing these birds at an early opportunity. 

 He also exhibited a specimen of the Chlamydosaurus Kingii, Gray, 

 recently brought from Melville Island. 



Mr. Yarrell, on behalf of Mr. Gould, exhibited a specimen of a 

 Warbler, new to the British Fauna, which had been shot at Kilburn, in 

 the month of October. 



Thjs specimen was represented to be the Black Red-tail of Latham's 

 Synopsis ; the Sylvia Titkys of the same author's Index Ornithologicus ; 

 and the Bee Jin rouge-queue of M. Temminck. lis more ordinary locality 

 was stated to be the northern part of Europe. 



Mr. Yarrell also exhibited a specimen of the Plectrophanes Lapponica 

 of Meyer, the Emberiza cakarafa of Temminck, which had been taken 

 in a net by a bird-catcher near London, late in the autumn. Two spe- 

 cimens of this bird also taken in England formed the subject of a paper 

 by Mr. Selby in the 15th volume of the Transactions of the Linnean 

 Society. The present specimen was the third example recorded of the 

 occurrence of the bird in this country. 



Mr. Yarrell, on his own part, exhibited the breast-bones and trachece 

 of a male and female Wild Swan killed in England, which differed in 

 several points from the anatomical distinctions known to exist in the 

 Hooper, parts of which were also shevra in comparison. 



The new species was stated to be nearly one-third less than the Hooper 

 in size, yet the insertion of the trachea within the sternum was much 

 deeper in the new one, with this remarkable difference, that the convo- 

 luted tube of the windpipe, after passing vertically through the whole 

 length of the keel, took then a horizontal direction, and occupied the 

 posterior flattened portion of the sternum, a conformation which had 

 never been found by Mr. Yarrell in the oldest male Hoopers. The tube of 

 the trachea in the new species was shewn by comparison to be of smaller 

 calibre, and the bronchicE less tlian half the length of the same parts in 

 the Hooper. Extracts from Hearne's Voyages, and the Philosophical 

 Transactions, were referred to, shewing that both species were known 

 in North America, the smaller sort being more rare tlian the large. 



Mr. Yarrell did not propose any. term for this hitherto unnamed spe- 



