ADVERTISEMENT. 



The scientific publications of the National Museum consist of two 

 series — Proceedings and Bulletins. 



The Proceedings, the first volume of which was issued in 1878, are 

 intended primarily as a medium for the publication of original 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 

 libraries, and scip^tific establishments, and, in view of the importance 

 of the more jiron^lpl'/dissemination of new facts, a limited edition of 

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

 whjch thes^ separ^^ie papfers are published are recorded in the table 

 of GGii tents <d|. tb'e,' ;V^/ukime. 



The present volume ],s -the forty-first of this series. 



T]hf) Bu}lc;tin,.'f)Vifeliftatf9n 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 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 1902 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 been published as Bulletins. 



Richard Rathbun, 

 Assistant Secretary, Smithsonian Institution, 



In charge of the United States National Museum. 



May 20, 1912. 



