ADVERTISEMENT. 



Tho scientific publications of the Xatioiiai Museum consist of two series — the 

 Bitll'tui and the l'rore<'diii</x. 



The BiilUtin^ publication of which was begun in is75, is a series of more or less 

 extensive works inteiuled to illustrate the collections of tho United States National 

 Museum and, with the exception noted below, is issued sepai'ately. These bulletins 

 are monograpiiic in scope and are devoted principally to the discussion of large 

 zoologic'al and botanical groups, faunas and floras, contributions to anthropology, 

 rejjorts of expeditions, etc. They arc usually of octavo size, although a quarto form, 

 known as the Special Bulletin, has l)een adopted in a ft>w instances in whicii a larger 

 page was deemed indispensable. 



This vfork forms No. 59 of the Bulletin series. 



Since liHJii the volumes of the series known as ''' Cmtributioivi from the National 

 Uii'hariutii,''' and containing papers relating to the botanical collections of the 

 Museum, have been publislied as bulletins. 



The Proceed! )i(/»^ the first volume of which was issued in ISTS, are intended as a 

 medium of publication of i)rief original papers Iiased on the coll(>ctions of the National 

 Museum, and setting forth newly acipiired facts in biology, anthropology, and 

 geology derived therefrom, or containing descriptions of new forms and revisions of 

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

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

 dissemination of n(^w facts a limited edition of each paper is printed in pamphlet 

 form in uihance. 



Charles D. Walcott, 

 Secretary of the Smithsonian Institution. 

 Wasiiingtox, U. S. A., June iJ, 1007. 



