ADVERTISEMENT. 



This work (Special Bulletin No. 4) is one of a series intended to illustrate the collections. 

 belonging to, or placed in charge of, the Smithsonian Institution and deposited in the United 

 States National Museum. 



The publications of the National Museum consist of two series, the Bulletin and the Proceedings. 



The Bulletin comprises complete technical works of considerable size, zoological mono- 

 graphs, handbooks of the Museum collections, records of scientific expeditions, etc. Most of the 

 volumes hitherto published have been octavos, but a quarto form has been adopted for works like 

 the present one, which, on account of the character of the illustrations, require a large page. 



The Proceedings are intended primarily as a medium of publication for shorter technical 

 papers, many of them of a preliminary character, containing newly acquired facts relating to 

 biology, anthropology, and geology, new schemes of classification, descriptions of new forms of 

 animals and plants, discussions of nomenclature, and the diaries of minor expeditions. 



The Proceedings are issued annually to libraries in volumes of about 1. ()(><> pages. A small 

 edition of each paper is distributed in pamphlet form to specialists in advance of the bound 

 volume. 



Papers of more general popular interest are published in the appendix to the Annual Report. 



Papers intended for publication in the Proceedings and Bulletin are referred to an advisoiy 

 committee composed as follows: Frederick W. True (chairman), William H. Holmes, George P. 

 Merrill, James E. Benedict, Otis T. Mason, Leonhard Stejneger, Lester F. Ward, and Marcus 

 Benjamin (editor). 



S. P. LANGLEY, 

 Secretary of the Smithsonian Institution. 



WASHINGTON, D. C., J/</v7 IB, W04. 



