ADVERTISEMENT. 



This work (Bulletin No. 53) is one of a series of papers intended to 

 illustrate the collections belonging to or placed under the charge of the 

 Sniitlisonian Institution and deposited in the United States National 

 Museum. 



The publications of the National Mu.seuni consist of two series — the 

 Bidlctin and the Proceedings. 



The Bu/lefhi, publication of which was connnenced in 1875, is a .series 

 of elaborate papers i.s.sued separately and based for the most part upon 

 collections in the National Museum. They are monographic in scope 

 and are devoted principally to the discussion of large zoological groups, 

 bibliographies of eminent naturalists, reports of expeditions, etc. The 

 bulletins, issued only as volumes with one exception, are of octavo size, 

 although a quarto form, known as the Special Bulletin, has been adopted 

 in a few instances in which a larger page was deemed indi.spen.sable. 



The Proceedings (octavo), the first volume of which was issued in 

 1878, are intended primarily as a medium of publication for newly 

 acqxiired facts in biology, anthropology^ and geology, descriptions of new 

 forms of animals and plants, di.scus.sions of nomenclature, etc. A volume 

 of about 1,000 pages is issued annually for distribution to libraries, while 

 a limited edition of each paper in the volume is printed and distributed 

 in pam])hlet form in advance. 



In addition, there are j)rinted each year in the second volume of the 

 vSmithsonian Report (known as the Report of the U. vS. National 

 Mu.seum) papers, chiefly of an ethnological character, describing collec- 

 tions in the National Mu.seum. 



Papers intended for publication by the National Mu.seuni are usually 

 referred to an advi.sory connnittee, composed as follows: Frederick W. 

 True (chairman), William H. Holmes, George P. Merrill, James E. 

 Benedict, Otis T. Mason, Leonhard Stejueger, Lester F. Ward, and 

 Marcus Benjamin (editor). 



S. P. Laxglkv, 

 Secretary of tlie SniiiJisonian bistilution. 



Washington, U. S. A.,Junei, 1903. 



