ADVERTISEMENT. 



The publications of the National Museum consist of two series, 

 Proceedings and Bulletins. 



The Proceedings, the first volume of which was issued in isTs, arc 

 intended primarily as a medium for the publication of original papers 

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

 acc^uired facts in biology, anthropology, and geology derived there- 

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

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

 libraries and scientific establishments, and in view of the impoi'tance 

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

 each paper is published 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 twenty-ninth of this series. 



The Bulletin, pu))licati()n of which was begun in 1875. is a series 

 of more elaborate papers, issued separately and, like the Proceedings, 

 based chiefly on the collections of the National Museum. 



A ({uarto form of the Bulletin, known as the Special P)ulletin, has 

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

 indispensaljle. 



Since 1902 the volumes of the series known as Contributions from 

 the U. S. National Herbarium, and containing papers relating to the 

 Iwtanical collections of the Museum, have l)een published as I)ulletins. 



Richard Rathbun, 

 ActliKj Secrefdi'i/ of flw SnufJtsoni(i)i litxfiiut'ion. 



Ill 



