ADVERTISEMENT 



The scientific publications of the National Museum include two 

 series, known, respectively, as Proceedings and Bulletin. 



The Proceedings, begun in 1878, are intended prunarily 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 geolog}^, with descriptions of new forms and 

 revisions of limited gi-oups. 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 tables of contents of each of the volumes. 



The present volume is the hundred and eighth of this series. 



The Bulletin, the first of which was issued in 1875, consists of a 

 series of separate publications comprising monographs of large 

 zoological groups and other general systematic treatises (occasionally 

 in several volumes), fauna! works, reports of expeditions, catalogs of 

 t3^pe 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 which large plates v/ere 

 regarded as indispensable. 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. 



Remington Kellogg, 

 Director, United States National Museum. 

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