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The scientific publications of the National Museum include two series 

 known, respectively, as Proceedings and Bulletin. 



The Proceedings series, begun in 1878, is intended primarily as a medium 

 for the publication of original papers based on the collections of the National 

 Museum, that set forth newly acquired facts in biology, anthropology, and 

 geology, with descriptions of new forms and revisions of limited groups. 

 Copies of each paper, in pamphlet form, are distributed as published to 

 libraries and scientific organizations and to specialists and others interested 

 in the different subjects. The dates at which these separate papers are 

 published are recorded in the table of contents of each of the volumes. 



The series of Bulletins, the first of which was issued in 1875, contains 

 separate publications comprising monographs of large zoological groups 

 and other general systematic treatises (occasionally in several volumes), 

 faunal works, reports of expeditions, catalogs of type specimens, special 

 collections, and other material of similar nature. The majority of the volumes 

 are octavo in size, but a quarto size has been adopted in a few instances. In 

 the Bulletin series appear volumes under the heading Contributions from the 

 United States National Herbarium, in octavo form, published by the National 

 Museum since 1902, which contain papers relating to the botanical collections 

 of the Museum. 



The present work forms No- 205 of the Bulletin series. 



Remington Kellogg, 

 Director, United States National Museum. 



UNITED STATES 



GOVERNMENT FEINTING OFFICE 



WASHINGTON t 1955 



For sale by the Superintendent of Documents, U. S. Government Printing Office 

 Washington 25, D. C. - Price $3.50 (paper cover) 



