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The scientific publications of the National Museum include two 

 series, known, respectively, as Proceedings and Bulletin. 



The Proceedings^ begun in 1878, are 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 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 tables of contents of each of the volumes. 



The present volume is the hundredth of this series. 



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

 series of separate publications comprising monogi-aphs of large zoo- 

 logical gi'oups 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 when large plates were regarded as indispensa- 

 ble. In the Bulletin series appear volumes under the heading Gontri- 

 hutions from the United States National Herbarium, in octavo form, 

 published by the National Museum since 1902, wiiich contain papers 

 relating to the botanical collections of the Museum, 



Remington Kellogg, 

 Director, U. S. National Musewn. 



