Piibluulivns of the United States Mitia/tal Museum 



The scholarly and scientific publications of the L'nited States National Museum 

 include two series, J'roteedings of the United Slates Niitioiiat Museum and United States 

 Xational Museum Bulletin. 



In these series, the Museum publishes urininal articles and monographs dealing 

 with the collections and work of its constituent museums — The Museum of Natural 

 History and the Museimi of History and Technolog) — setting forth newly accjuired 

 facts in the fields of anthropology, biology, history, geology, and technology. Copies 

 of each publication are distributed to libraries, to cultiu-al and scientific organizations, 

 and to specialists and others interested in the different subjects. 



1 he Proceedings, begiui in 1878, are intended for the publication, in separate form, 

 of shorter jjapers from the Museum of Natural History. These are gathered in volumes, 

 octavo in size, with the publication date of each paper recorded in the table of contents 

 of the volume. 



In the Bulletin series, the first of which was i.ssued in 1875, appear longer, separate 

 publications consisting of monographs (occasionally in several parts) and volumes in 

 which are collected works on related subjects. Bulletins are either octavo or quarto in 

 size, depending on the needs of the presentation. Since 1902 papers relating to the 

 botanical collections of the .Museum of Natural History have been published in the 

 Bulletin series under the heading Contributions from the L'nited States .Xational Herbarium. 

 and since 1959, in Bulletins titled "Contributions from the Museum of History and 

 Technology," have been gathered shorter ])apers relating to the collections and 

 research of that Museum. 



This work forms volume 253 of the Bulletin series. 



Frank A. Taylor 

 Director. United States .Xational Museum 



Tor sale by the SiiperintomJcnt of Dccuments, U.S. Government Printing Office 

 Washington, D C'. ■JU-in^ - Price $3.75 



