ADVERTISEMENT. 



The publication.^ of the National .Aluseiini consist of two series 



roceedino-s and BLdletins, ' ' 



i P'l ^i-«^'eedings, the lirst volume of which was issued in 1878 are 

 intended primarily as a medium for the publication of orio-inal papers 

 based on the collections of the National Museum, setting forth newly 

 acquired facts in biology, anthropology, and geology derived there- 

 from, or containing- descriptions of new forms and revisions of limited 

 groups. A volume is issued annually or oftener for distribution to 

 libniries and scientific establishments, and in view of tlie importance 

 o± the more prompt dissemination of new facts, a limited edition of 

 each paper is printed in pamphlet form in advance. The dates at 

 which these separate papers are published are recorded in the table of 

 contents of the volume. 



The present volume is the thirtieth of this series. 



The Bulletin, publication of which was beg-un in 1875, is a series of 

 more elaborate papers, issued separately, and, like the Proceeding's 

 based chiefly on the collections of the National Museum 



A quarto form of the Bulletin, known as the "Special Bulletin " has 

 been adopted in a few instances in which a larger page was deemed 

 indispensable. 



Since 1002 the volumes of the series known as - Contributions from 

 the National Herbarium," and containing papers relating to the botan- 

 ical collections of the Museum, have heen pul)lished as Bulletins. 



Richard Rathbun, 



ActuHj Secretary of the Smithsonian Institution. 



