ADVERTISEMENT 



The scientific publications of tlie 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 lim- 

 ited groups. One or two volumes are completed annually and copies 

 of each paper, in pamphlet form, are distributed, as soon as pub- 

 lished, to libraries and scientific organizations, and to speciahsts and 

 others interested in the different subjects. The dates at which these 

 separate papers are published are recorded in the table of contents 

 of the volume. 



The present volume is the sixty-fourth of this series. 



The Bulletin, publication 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 papere relating to the 

 botanical collections of the Museum, have been published as Bulletins. 



William deC. Ravenel, 

 Administrative Assistant to the Secretary, 

 in Charge of the United States National Museum. 



February 7, 1925. 



