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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, 

 anthi'opology, and geology, with descriptions of new forms and revi- 

 sions 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, con- 

 tains 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 speci- 

 mens, special collections, and other material of similar nature. The 

 majority of the volumes are octavo in size, but a qua,rto 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. 206 of the Bulletin series. 



Remingtoi^ Kellogg, 

 Director, United States National Museum. 



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