6 Introduction. 



It now only remains to thank those who have encouraged me in 

 my work, among whom I must especially mention my former Museum 

 colleagues, Dr R. Bowdler Sharpe and Mr W. R. Ogilvie Grant, as 

 well as their assistants, Mr Charles Chubb and Mr James Wells, 

 who have given me eveiy facility in examining the unrivalled 

 collection of bird-skins under their charge. 



The following works have been referred to in these articles : — 



The Avicultural Magazine, 1st and 2nd series, Svo. 



Butler, A. G., British Birds with their Nests and Eggs, vols, i.-iii., It". 



Hints on Cage- Birds, 8vo. 



Foreign Bird-Keeping, 4to. 



Foreign Finches in Captivity, 1st edition, 4to. 

 Congress of Arts and Sciences, Universal Exposition, St Louis, 1904, vol. v. 

 Gadow, Hans, Catalogue of Birds in British Museum, vol. viii., 8vo. 

 Gould. John, Handbook of Birds of Australia, vols. i. and ii., 8vo. 

 Jkrdon, T. C, Birds of India, vols. ii. ami iii., Svo. 

 List of Animals in the Gardens of the Zoological Society, 9tli edition, 



1896, Svo. 

 Proceedings of the United States National Museum, vol. xxviii. 

 Ridgway, Robert, Birds of North and Middle America vols. i. and ii. 

 Russ, Karl, Die Fremdlandischen Stubenvbgel, vols. i. and ii., Svo. 



Handbuch fur Vogclliebhaber, 8vo. 

 Salvadori, T. , Catalogue of Birds in the British Museum, vols. xx. and 



xxi., 8vo. 

 Saunders, Howard, A Manual of British Birds, Svo. 

 Sclater, P. L. . Catalogue of Birds in the British Museum, vol. xi., 8vo. 

 St later and Hudson, Birds of the Argentine Republic, vol. i., 8vo. 

 Seth-Smith, David, Parrakcets, 8vo. 

 Sharpe, R. B., Catalogue of Birds in the British Museum, vols. vi. , xii. 



and xiii. , 8vo. 

 Shelley, G. E., Birds of Africa, vols. iii. -v., 8vo. 

 Stark and Sclater, Birds of South Africa, vols, i.-iii., 4to. 

 Whitaker, J. I. S. . Birds of Tunisia, vol. i., 8vo. 

 The Zoologist for 1900, 8vo 



Many other works have been consulted, but without yielding any 



information of the slightest use to me, so that it is not worth while 



to note them here. 



A. G. Butler. 



July 1907. 



