ADVERTISEMENT. 



The scientific publications of the National Museum consist of two 

 series — the Bulletin and the Proceedings. 



The Bulletin^ publication of which was begun in 1875, is a series of 

 more or less extensive works intended to illustrate the collections of the 

 United States ^"^ational Museum, and, with the exception noted below, 

 is issued separateh". These bulletins are monographic in scope and are 

 devoted principallj^ to the discussion of large zoological and botanical 

 groups, faunas and floras, contributions to anthropology, reports of 

 expeditions, etc. The}" are usual!}" 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 indispensable. 



This work forms No. 58 of the Bulletin series. 



Since 1902 the volumes of the series known as " Contributions from 

 the JSational Iltrhariuni,''^ and containing papers relating to the botan- 

 ical collections of the Museum, have been published as bulletins. 



The Proceedings., the first volume of which was issued in ISTS, are 

 intended as a medium of publication of brief original papers based on 

 the collections of the National Museum, and setting forth newly acquired 

 facts in biology, anthropology, and geology derived therefrom, or con- 

 taining descriptions of new forms and revisions of limited groups. A 

 volume is issued annually, or oftener, for distriljution to lil>raries and 

 scientific establishments, and in view of the importance of the more 

 prompt dissemination of new facts a limited edition of each paper is 

 printed in pamphlet form in advance. 



Charles D. Walcott, 

 Secretary of the /Smithsonian Institution. 



Washincjtox. U. 8. A., June 15, 1907. 



Ill 



